imgui-knobs
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Added rotation behaviour.
Added two new flags:
- ImGuiKnobFlags_RotateRelative
- ImGuiKnobFlags_RotateAbsolute
With them you have to move around the knob in a circular way. Keyboard input is not currently implemented for these modes.
I attach a video of the relative mode.

Thanks for taking the time to review the commit.
Added a new commit. Let me know what you think about it.