Removed workarounds for alias templates, variadic templates and
anonymous enums, but 1.8.2 has some bug with forward declarations
causing classes to appear in default namespace, breaking
cross-references.
* Added missing forward declarations.
* Added getters and setters to ShapeRendererOptions class.
* Cube primitive is indexed, modified the mesh creation accordingly. It
now uses MeshTools, link the library to DebugTools.
* Simplified resource handling so it's now handled in one place. It
still needs to be thought out better.