Setup a working CMake build (#3504)

[feliwir]

• Compile C/C++ sourcecode with CMake
• Get git versioning setup
• Build parts database as a custom target
• Switch CI to CMake
• Use CPack to bundle installers
• Remove all qmake artifacts

[KjellMorgenstern]

Sorry, we don't plan to switch to cmake right now. If you want to get your hands dirty on Fritzing sources, there are quite number of issues already triaged as bugs, though :-)

[feliwir]

Sorry, we don't plan to switch to cmake right now. If you want to get your hands dirty on Fritzing sources, there are quite number of issues already triaged as bugs, though :-)

Yes, i somehow suspected that :)
However i plan some largers changes in my fork (e.g. modularization, Qt6 and more). I thought I'd do a draft PR in case you need wanted to use some of that work.

I'm used to CMake, so i don't want to stick with qmake for my personal well-being :)