Use CMake build system

[Wohlstand]

While now everything is building through raw makefiles, I want to have CMake which is very advanced, flexible, and easy to use.

What new build must be able:

• [x] Option to compile gen_adldata.cpp before libADLMIDI itself and run it to rebuild banks database
• [x] Option to build libADLMIDI without of embedded banks
• [x] Option to build demo player with auto-detection of libSDL2
• [x] Compile static and shared variants
• [x] Install library into system
• [x] Abort on attempt to build with any missing dependencies

Build on operating systems

Entire CMake project must be buildable and tested on next operating systems and toolchains:

• Linux
  • [x] GCC Makefile
  • [x] CLang Makefile
• Windows
  • [x] MinGW vanilla Makefile
  • [x] MinGW-w64 Makefile
  • [x] MSVC 2015 project
  • [x] MSVC 2017 project
• macOS
  • [x] Xcode project
  • [x] CLang Makefile
• MS-DOS (To compile for hardware OPL3 output instead of emulator)
  • [x] DJGPP (Originally supported in ADLMIDI)
  • [ ] OpenWatcom (Try as 16-bit dos applocation or 32-bit as Dos4gw application)

[Wohlstand]

Everything is complete! Works on Linux and Windows (MinGW). MacOS and Windows-MSVC test is needed.

[Wohlstand]

Finally works on MSVC, even GenAdldata while building (however in-ide adldata's progress output log is glitchy). macOS is not tested yet.

[Wohlstand]

Okay, libADLMIDI now is usable on DJGPP too to have hardware support for OPL3 chip. ADLMIDI2 (reorganized original ADLMIDI tool) works fine:

I'll try to add support for OpenWattcom.

[Wohlstand]

OpenWattcom, unfortunately, hard to support because of cluncky implementation of STL, especially a memory management and RB-Tree used by std::set and std::map. Therefore usage of those classes cauaes application to crash. Also, std::stringstream is not implemented, a dummy header with "TODO" was prrsented instead of real implementation. The test was done on DOS, as demo music tool needs SDL2 be also built on OpenWattcom to work on modern operating systems such as Linux. As alternative, try to implement a direct usage of PulseAudio to pass audio output through it.

[Wohlstand]

Okay, to debug a workflow on OpenWatcom under Linux is need to only make the "Wave-Only" version that only can write WAV files. Then we are will be able to debug the build.

[Wohlstand]

Okay, ADLMIDI2 now works on macOS! (include playing with a rewerb!) It is buildable through both XCode project and Makefile ways.

However, it is glitchy when exiting from the player... It's common issue, but also happens on macOS too:

[Wohlstand]

Okay, looks like the stuff is fine now. Related to Watcom side, looks like it's a very buggy case, and looks like I need to use a different thing for it.