Merge pull request #133 from dariomanesku/master

Imgui updates + setWindowTitle() fix.
Display example executable name in window title.
Cleanup.
Added support for *s_4_0_level_9_3 profile DX11 shaders.
Rebuilt shaders.
Cleanup.
Added optional parameters for imguiIndent().
Fixing imguiTabs() indentation problem.
Fine tuning imguiScrollArea sizes.
Added optional _r (corner radius) parameter for imguiBeginScrollArea().
Minor imgui fixes.
Added imguiLabel() overload.
Added overload for imguiTabs() with look customization parameters.
Reordering imguiBeginScrollArea() parameters.
Added optional parameter for imguiButton().
Added optional parameter for imguiEndScrollArea().
Added optional parameter for imguiInput().
Removed imguiImageSwizzle() and added imguiImageChannel().
Added macro constants for default imgui parameters.
Imgui scroll fix for variable scrollable area height.