CLion/KDevelop IDE integration

[JulianGro]

This PR aims to make it easier to switch build types in CLion and other IDEs.

• Updated Linux build configuration to use Ninja Multi-Config.
• Updated OVERTE_MEMORY_DEBUGGING and OVERTE_THREAD_DEBUGGING. (Though unfortunately neither of them are working for me…)
• Added CLion and KDevelop documentation in BUILD_IDE.md.
• Added CLion profiles for the most common configurations.
  

I initially intended to document how to use KDevelop on Windows as well, but unfortunately every version I tried just crashes on startup right now.

OVERTE_MEMORY_DEBUGGING fails to link:

/usr/bin/ld: libraries/gpu/Debug/libgpu.so: undefined reference to `typeinfo for gpu::Renderpass'

I don't really understand what this means, since this doesn't fail without memory debugging.

OVERTE_THREAD_SANITIZER cannot be found?

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/home/juliangro/.gdbinit:1: Error in sourced command file:
Support for debuginfod is not compiled into GDB.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6e5495a in ___interceptor___cxa_atexit (f=0x7ffff6e4e710 <__tsan::finalize(void*)>, arg=0x0, dso=0x0) at ../../../../src/libsanitizer/tsan/tsan_rtl.h:253
warning: 253	../../../../src/libsanitizer/tsan/tsan_rtl.h: Datei oder Verzeichnis nicht gefunden
The target architecture is set to "auto" (currently "i386:x86-64").

[RTUnreal]

I am unsure if it is out-of-scopre for this PR, but would adding generic clangd support also be possible?

here is a good tutorial for adding support for it: https://gist.github.com/Strus/042a92a00070a943053006bf46912ae9

[JulianGro]

To me this is out of scope. The reason I added documentation for CLion and KDevelop specifically, is that CLion allows us to set predefined profiles, KDevelop needs a lot of handholding, and both of them are relatively popular among Overte contributors.

CLion also supports Clangd out-of-the-box; I just cannot tell if it is enabled by default or not (since my settings are synced using my JetBrains account).