Add wireframe mode/Adjust aabb modes/Rename debug modes as render modes

[T-rvw]

To implement wireframe in bgfx, author suggests to use bgfx::topologyConvert to create another index buffer for wireframe lines. The reason is that bgfx doesn't support different fill modes in rasterize stage for different drawcalls and its wireframe mode is a global flag which will affect all drawcalls.

And bgfx also doesn't support geometry shader which can easily generate barycentric coordinates to render wireframe in one pass...

And generate barycentric coordinates offline need to duplicate vertices because it should follow 3-color graph rule... If you don't want to duplicate, it is difficult to reorder indexes. It is possible in most cases but not all caes...

So here comes a stupid but workable solution. Also adjust AABB/DebugModes user experience details:

• Wireframe
  • RenderMode::wireframe
    • enable : draw all meshes in wireframe
    • disable : draw selected mesh in wireframe
• AABB
  • AABB switch button
    • enable : draw all aabbs
    • disable : draw aabb for collision mesh component which enable DebugDraw
• RenderMode same to Blender concepts
  • Wireframe
  • Solid : shading in white model or just no textures(Maybe try to use PBR without any textures?)
  • Material Preview : no support
  • Rendered : pbr material shading

[T-rvw]

Closes #112 .