add Raqm license and readme

src/thirdparty/raqm/AUTHORS

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+Abderraouf Adjal
+Ali Yousuf
+Anood Almuharbi
+Asma Albahanta
+Fahad Alsaidi
+Ibtisam Almabsali
+Khaled Hosny
+Mazoon Almaamari
+Shamsa Alqassabi

src/thirdparty/raqm/COPYING

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+The MIT License (MIT)
+
+Copyright © 2015 Information Technology Authority (ITA) <foss@ita.gov.om>
+Copyright © 2016 Khaled Hosny <khaledhosny@eglug.org>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/thirdparty/raqm/NEWS

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+Overview of changes leading to 0.7.1
+Sunday, November 22, 2020
+====================================
+
+Require HarfBuzz >= 2.0.0
+
+Build and documentation fixes.
+
+Overview of changes leading to 0.7.0
+Monday, May 27, 2019
+====================================
+
+New API:
+  * raqm_version
+  * raqm_version_string
+  * raqm_version_atleast
+  * RAQM_VERSION_MAJOR
+  * RAQM_VERSION_MICRO
+  * RAQM_VERSION_MINOR
+  * RAQM_VERSION_STRING
+  * RAQM_VERSION_ATLEAST
+
+Overview of changes leading to 0.6.0
+Sunday, May 5, 2019
+====================================
+
+Fix TTB direction regression from the previous release.
+
+Correctly detect script of Common and Inherite characters at start of text.
+
+Undef HAVE_CONFIG_H workaround, for older versions of Fribidi.
+
+Drop test suite dependency on GLib.
+
+Port test runner to Python instead of shell script.
+
+New API:
+* raqm_set_invisible_glyph()
+
+Overview of changes leading to 0.5.0
+Saturday, February 24, 2018
+====================================
+
+Use FriBiDi 1.x API when available.
+
+Overview of changes leading to 0.4.0
+Sunday, January 21, 2018
+====================================
+
+Set begin-of-text and end-of-text HarfBuzz buffer flags.
+
+Dynamically allocate memory instead of using stack allocation for input text.
+
+Accept zero length text and do nothing instead of treating it as error.
+
+Overview of changes leading to 0.3.0
+Monday, August 21, 2017
+====================================
+
+Fix stack corruption on MSVC.
+
+New API:
+* raqm_set_freetype_load_flags
+
+Overview of changes leading to 0.2.0
+Wednesday, August 25, 2016
+====================================
+
+Fix building with MSVC due to lacking C99 support.
+
+Make multiple fonts support actually work. Start and length now respect the
+input encoding.
+
+New API:
+* raqm_index_to_position
+* raqm_position_to_index
+* raqm_set_language
+
+Overview of changes leading to 0.1.1
+Sunday, May 1, 2016
+====================================
+
+Fix make check on 32-bit systems.
+
+Overview of changes leading to 0.1.0
+Wednesday, January 20, 2016
+====================================
+
+First release.

src/thirdparty/raqm/README

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+Raqm
+====
+
+[![Linux & macOS build](https://travis-ci.org/HOST-Oman/libraqm.svg?branch=master)](https://travis-ci.org/HOST-Oman/libraqm)
+[![Windows build](https://img.shields.io/appveyor/ci/HOSTOman/libraqm/master.svg)](https://ci.appveyor.com/project/HOSTOman/libraqm)
+
+Raqm is a small library that encapsulates the logic for complex text layout and
+provides a convenient API.
+
+It currently provides bidirectional text support (using [FriBiDi][1]), shaping
+(using [HarfBuzz][2]), and proper script itemization. As a result,
+Raqm can support most writing systems covered by Unicode.
+
+The documentation can be accessed on the web at:
+> http://host-oman.github.io/libraqm/
+
+Raqm (Arabic: رَقْم) is writing, also number or digit and the Arabic word for
+digital (رَقَمِيّ) shares the same root, so it is a play on “digital writing”.
+
+Building
+--------
+
+Raqm depends on the following libraries:
+* [FreeType][3]
+* [HarfBuzz][2]
+* [FriBiDi][1]
+
+To build the documentation you will also need:
+* [GTK-Doc][4]
+
+To install dependencies on Fedora:
+
+    sudo dnf install freetype-devel harfbuzz-devel fribidi-devel gtk-doc
+
+To install dependencies on Ubuntu:
+
+    sudo apt-get install libfreetype6-dev libharfbuzz-dev libfribidi-dev \
+                         gtk-doc-tools
+
+On Mac OS X you can use Homebrew:
+
+    brew install freetype harfbuzz fribidi gtk-doc
+    export XML_CATALOG_FILES="/usr/local/etc/xml/catalog" # for the docs
+
+Once you have the source code and the dependencies, you can proceed to build.
+To do that, run the customary sequence of commands in the source code
+directory:
+
+    $ ./configure
+    $ make
+    $ make install
+
+To build the documentation, pass `--enable-gtk-doc` to the `configure` script.
+
+To run the tests:
+
+    $ make check
+
+Contributing
+------------
+
+Once you have made a change that you are happy with, contribute it back, we’ll
+be happy to integrate it! Just fork the repository and make a pull request.
+
+Projects using Raqm
+-------------------
+
+1. [ImageMagick](https://github.com/ImageMagick/ImageMagick)
+2. [LibGD](https://github.com/libgd/libgd)
+3. [FontView](https://github.com/googlei18n/fontview)
+4. [Pillow](https://github.com/python-pillow)
+5. [mplcairo](https://github.com/anntzer/mplcairo)
+
+The following projects have patches to support complex text layout using Raqm:
+
+2. SDL_ttf: https://bugzilla.libsdl.org/show_bug.cgi?id=3211
+3. Pygame: https://bitbucket.org/pygame/pygame/pull-requests/52
+4. Blender: https://developer.blender.org/D1809
+
+
+
+[1]: http://fribidi.org
+[2]: http://harfbuzz.org
+[3]: https://www.freetype.org
+[4]: https://www.gtk.org/gtk-doc