build status: toolchains, deployment, extensions

[jakoch]

This issue tracks work progress on the build toolchains for Linux, Mac, Windows
and the automatic deployment setups
and the build status of extensions:

Github Actions

Linux

• Clang
  • Release
  • Debug
• GCC

Windows

• MSVC 17
  • Release
  • Debug

Mac

• Clang
  • Release
  • Debug
• Gcc

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NOTE: We will not build using MinGW.

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Fifechan Extensions

The following extensions are build:

• OpenGL (PR 27)
• SDL (PR 27)

The following extensions were removed:

• Allegro
• Irrlicht