Split engine to packages NazaraUtils and NZSL (#375)

* Move code to NazaraUtils and NZSL packages

* Reorder includes

* Tests: Remove glslang and spirv-tools deps

* Tests: Remove glslang init

* Remove NazaraUtils tests and fix Vector4Test

* Fix Linux compilation

* Update msys2-build.yml

* Fix assimp package

* Update xmake.lua

* Update xmake.lua

* Fix shader compilation on MinGW

* Final fixes

* The final fix 2: the fix strikes back!

* Disable cache on CI

* The return of the fix™️

.github/workflows/coverage.yml

@@ -89,7 +89,7 @@ jobs:
 
     # Setup compilation mode and install project dependencies
     - name: Configure xmake and install dependencies
-      run: xmake config --shadernodes=y --tests=y --unitybuild=y --arch=${{ matrix.config.arch }} --mode=coverage --yes
+      run: xmake config --ccache=n --shadernodes=y --tests=y --unitybuild=y --arch=${{ matrix.config.arch }} --mode=coverage --yes
 
     # Build the engine
     - name: Build Nazara