Release v0.5

[flyx]

There have been some major changes since v0.4 has been released. Notably the complete overhaul of runtime loading and a lot of added examples. To get more people interested in OpenGLAda, it would be good to make a release.

This issue is for tracking down things to do before the next release.

Tasks:

• [x] Make sure the new runtime loading stuff is properly documented.
• Evaluate whether there is code in the examples that could be moved into OpenGLAda itself (this is an invitation to @rogermc2 to propose stuff) Post-0.5
• [x] Make sure all examples work on all supported platforms; document working compiler versions.
  • [x] Test Windows
    • [x] AdaCore GNAT GPL 2017
    • [x] TDM-GCC-64 (since AdaCore only provides 32bit)
  • [x] Test macOS
    • [x] AdaCore GNAT GPL 2017
    • GNUAda GNAT GCC too much work; if GNAT GPL works, chances are good this one works too
  • Test Linux Would like to, but I do not have a native Linux system I can use, and trying to setup a VirtualBox that is able to run OpenGL has been proven too much of a pain.
  • [x] Add instructions for each platform about how to install the compiler and dependencies (GLFW, FTGL).
• [x] Review API documentation and add missing stuff if necessary.

[flyx]

Tests on Windows / GNAT GPL 2017:

Everything works but durian/buffers_and_textures and geometric_algebra/example_2.1 due to #92 .

[flyx]

Release done.