[WIP] Add MingwX64 (Windows) support

[xolider]

This PR adds support for Windows (MingwX64).
It uses LLVM (Clang) for compiling Skia rather than MSVC. To successfully build the mingwX64 target, you need to have LLVM installed and the "bin" folder in your PATH.

This is a work in progress. At this writing time, it successfully builds native bridge and link it to a static .lib library

If you have any comments or ideas to make it stable, please feel free to leave them here :)

I know there is an other opened PR for this goal, but it seems to be out-of-date and not maintained anymore

UPDATE: the compileKotlinMingwX64 task now completes successfully

[xolider]

To do:

• Implement the Skia layer
• Implement the clipboard logic
• Implement the cursor selector
• Implement the sample app - I am currently stuck at this step when trying to compile a skeleton implementation. I have the above error

[Syrou]

Looking forward to see this added

[xolider]

Looking forward to see this added

This error may due to the Skia's compilation method. Maybe the LLVM solution is not the right one. I would try to compile with MSYS2 Mingw64 to get rid of MSVC, but that means no access to Win32 API. I currently run out of time with my current job to check that

An another possible thing is that the Konan LLVM version is too old. I also tried to compile for linuxX64 and had issues with the provided libc library that was too old comparing my host's one, and lead to incompatibilities issues. As far is I heard, Jetbrains plan to bump LLVM/GCC versions with the next Kotlin 2 compiler