Build system and tools

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Related issues
	Bug #2017: Build .pack/PK3 packages using CMake, with dependency tracking and automatic rebuilding
	Bug #2376: Map geometry is garbled using GCC 5 on Fedora
	Bug #2431: Doomsday needs libfluidsynth1 but ubuntu 20.04 provides libfluidsynth2 only
	Bug #2441: [3.0] build deps libraries are installed in different subdir (not found by executable)
	Bug #2455: rpm package requires libfluidsynth.so.1 but Fedora 33 provides libfluidsynth.so.2 only
	Feature #1688: Command line options documented with Amethyst
	Feature #2355: Build must fail on macOS notarization error

Doomsday Engine