Making imgui scroll behave properly.
Added _enabled parameter for imguiImage.
Making imguiImageChannel properly handle newly introduced _enabled parameter.
Making imguiCollapse more aesthetically pleasing.
Turning on nvg scissor in imguiScroll.
Making imguiTabs look better when disabled.
Adding _size parameter for imguiColorWheel.
Added imguiSetCurrentScissor().
NVG now flushes on imguiEndArea().
Merge pull request #189 from dariomanesku/master

Imgui updates.