Miscellaneous for v0.03

[LukasBanana]

Miscellaneous scheduled features:

• [x] Secondary GenerateMips function with parameters for a range of MIP-levels and array slices.
• [x] Extend D3D11StateManager to avoid redundant calls to VSSetShader etc.
• [x] Multi-sampling support for GL renderer on Linux.
• [x] Multi-sampling support for D3D12 renderer.
• [x] Multi-sampling support for Vulkan renderer.
• [x] Depth texture support in D3D11 renderer.
• [x] Add interface for indirect draw/dispatch commands with respective BufferType entries.
• [x] Better support of UAV and SRV distinction for D3D11 renderer.
• [x] CPU side fragment output binding for OpenGL renderer with ShaderDescriptor::fragment::outputAttribs.
• [x] Default image initialization of stencil values.