Bump Veldrid.ImGui to track 1.72b.

[D3D11] workaround for emulated command lists when setting CB w/ offset.

Bump Veldrid.ImGui to v1.69 of ImGui.NET.

Bump version to 4.6.1.

[Demo] Use platform default backend.

[Demo] Use platform default backend.

Update Veldrid.ImGui to 1.67 of dear imgui.

Add missing package descriptions and tags.

Make Veldrid.VirtualReality depend on a stable version of Veldrid.

Bump ImGui version and dependency to 5.66.0.