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Added GetScrollX(), GetScrollX(), GetScrollMaxX() apis + demo (#246)

Added optional Horizontal Scrollbar & allow user to explicitly set content width via SetNextWindowContentSize() etc (#246) ...

GetCursorPos, SetCursorPos, GetContentRegionMax,
GetWindowContentRegionMin, GetWindowContentRegionMax are now including
the scrolling amount. It PROBABLY shouldn't break anything for you, but
take note that SetCursorPosX(100.0f) puts you at +100 from the starting
x position which may include scrolling, not at +100 from the window left
side.

Added GetContentRegionAvailWidth() helper. Demo tweaks.

Minor internal shortcuts not calling GetCurrentWindow()

Style: rename ScrollbarWidth to ScrollbarSize (sorry!)

Split tree/collapsable into internal TreeNodeBehaviorIsOpened() helper (unsure..) (#282)

IO.WantInputCharacters -> WantTextInput (#305)

Removed default name parameter in Begin() ...

We already have a "Debug" window pushed to the stack in the first place
so it's not really a useful default.

AddBezier()->AddBezierCurve(). PathBezierTo()->PathBezierCurveTo(), and reads current point back, more standard (#311)

ImDrawList: added AddBezier(), PathBezierTo() for cubic bezier curves (#311)

Examples: OpenGL: fix for retina screens + io.DisplayFramebufferScale storage (#287)

ImDrawData: added ScaleClipRects() helper (#287)

Added ColorConvertU32ToFloat4() helper and ImColor(ImU32) constructor.

Added GetWindowHeight() for completeness + BeginGroup() comment.

ImDrawList: Add comments on the usage of drawing channels

ImDrawList: Fixed issues with channels split/merge. Functional without manually adding a draw cmd. + Removed unnecessary parameter to Channe

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Removed obsolete comment

Trim trailing whitespace (#305)

Remove CaptureInputCharactersFromApp and minor cleanups (#305)

Added flag showing whether the GUI wants text input ...

Conflicts:
	imgui.cpp

Added GetMousePosOnOpeningCurrentPopup().

ImGuiTextFilter: default parameter width=0.0f for no override, allow override with negative values

ImGuITextBuffer: shallow tweak.

ImGuiTextFilter::PassFilter() supports string range. Added [] helper to ImGuiTextBuffer.

Renaming some argument to clarify the local vs screen coordinates

IsWindowHovered() takes account of window hoverability (may be disabled because of a popup) + comment ...

Was a dupe of IsMouseHoveringWindow() anyway, they are now "clearly"
different.

Allow to override ImDrawIdx type (#292)