v0.4.0

Basic HLMS editing

• Texture: diffuse, background diffuse, normal, roughness, metalness
• Diffuse color, background diffuse color, specular color
• Transparent value & mode
• Solid or wireframe
• Two-sided on/off

Mesh states:

• Show/hide bounding boxes
• Switch visibility

Other changes

• Fixed a crash when selecting the pistol at the beginning and then loading another model
• Fixed a crash when the material drop-down list emit an index of -1
• Change the clear color from sky blue to black
• Create a new Pbs Datablock for the mesh which doesn't come with materials
• Showing irradiance backgrounds in the beginning
• Using GL3+ as the default rendersystem due to some issues in D3D11 rendersystem