MeshCompiler :
- fix compilation warning
Core :
- fix SharedPtr Bool cast operator is const now
- improve resource state
- improve resource manager stack system
- fix resource loading case where the resource created and destroyed in the same frame
- declare ResourceRequest as POD type
Graphic :
- update Resources (add Unload method)
UnitTest :
- update levels (new resource state)
data :
- use carbon checker textures as default textures
UnitTest :
- update level4 (default textures)