- Moved every resource files to the <Assets/> directory
- We now use the argc, argv, from main so the Engine responds if a scene file is
opened by it
- Fixed relative paths <../../> problem, now we use the <Asets/> path
- Moved #define LT_ENGINE_RESOURCES_*_SHADER_* definitions to files
* Note: This was done so for a gcc compilation error caused by R"()" string
- Removed test print fps in 'Application::GameLoop()'