[tools] MSVC environment loader, POSIX vulkan/MSVC install scripts (#2993)

* also move install-vulkan-sdk.ps1 to tools

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2993
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Co-committed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>

.gitignore

@@ -7,6 +7,7 @@
 # Build directory
 /[Bb]uild*/
 doc-build/
+out/
 AppDir/
 uruntime
 
@@ -59,3 +60,4 @@ eden-windows-msvc
 artifacts
 *.AppImage*
 /install*
+vulkansdk*.exe