BeginPopupModal() can have an optional close-window button (#249)

Added BeginPopupModal() with actual modal behaviour (WIP api) (#249)

Minor comment fix (#248)

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering ...

Conflicts:
	imgui.cpp

Merge remote-tracking branch 'origin' into 2015-03-antialiased-primitives ...

Conflicts:
	imgui.cpp
	imgui.h

Added IsKeyReleased() (#248), added keyboard & mouse state panel in the demo window

Added IsMouseReleased() helper (#248)

Fixed leak on Shutdown (#200)

Comments

Fixed mouse wheel scroll issues, introduced a few weeks ago (#200)

Can't scroll with mouse wheel when window is collapsed.

InputTextMultiline() filtering out \r for now (#200)

InputTextMultiline() painfully merged most computation passes into one, better clipping, much faster for large text (#200)

ImFont::RenderText() better vertical clipping for large amount of text (for #200)

InputTextMultiline(): made ctrl+up/down closer to windows behavior (#200)

InputTextMultiline() fixed a frame of lag in handling vertical scrolling (#200)

InputText(): adjusting selection block height differently for single and multi-line (#200)

InputText(): removed a call to strlen() in the active edit path (#200)

InputTextMultine() optimised height calculation for inactive multi-line edit box (#200)

ImFont: CalcTextSizeA() fixed font scaling with fallback character.

InputText: fixed handling of scaled font. re-organized bits of code toward merging all sizes calculations (#200)

Fixed framerate counter averaging buffer size (shouldn't have been included in previous commit)

InputText(): removed extraneous CalcTextSizeW call for tracking cursor/scrolling, remove spike (#200)

InputText(): char width calculation calls font->GetCharAdvance() directly (#200)

ImFont::RenderText() faster handling of rendering above clipping rect (useful for #200)

InputText() clear selection when using undo/redo (#200)

InputText() tidying up (#200)

InputTextMultiline() preserve activeid/cursor/selection when using scrollbar + tidying up (#200)

Speeding up some wchar<>UTF8 functions and some specialization for Ascii. (testing 500 KB text for #200)

Cleanup