ImRect (internal) fixed ImVec4 constructor, argh (broken e7e2fcd)

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

Optimisation, removed the duplicate ClipRectStack in ImGuiWindow, storing single value

AA branch: ImDrawList: rename commands to cmd_buffer ...

Not strictly necessary but while we're doing minor breakage let's do
them at all once.

ImRect (internal) made constructors more non-optimised compilation friendly

ImDrawList: fixed non-merged commands when equal clip rectangles are in the two first commands

Metrics window: calculate bounding box of actual vertices when hovering a draw list.

Fixed ImRect.Add(ImVec2&) which was broken and somehow unused

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

Conflicts:
	imgui.cpp

ImDrawList store pointer to their owner name for easier auditing/debugging. Metrics windows render clip rectangle when hovering.

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

Documentation (#133 #254)

AA branch: added ImDrawData::DeIndexAllBuffers() helper (#254)

AA branch: ImDrawCmd idx_count -> elem_count

AA branch: io.RenderDrawListsFn signature changed to take ImDrawData, neater and future proof breaking of the render API (#133 #254)

Comments

Removed obsolete GetDefaultFontData() function that would assert anyway (obsoleted 2015/01/11)

PlotLines(), PlotHistogram(): fixed incorrect hovering test (would trigger tooltip when menu is open)

Comments

MenuItem() can be activated on release (#245)

Examples: DirectX9: fixed size passed to vertex and index buffer Lock() + readjust default buffer sizes.

AA branch: added style.AntiAliasedLines, style.AntiAliasedShapes (#133)

AA branch: comments, inlining minor ops

AA branch: AddPolyline() stores normals on stack

AA branch: AddConvexPolyFilled() store normals on stack

AA branch: oops, ImInvLengthSqr() is ImInvLength()

AA branch: AddPolyline(), AddConvexPolyFilled() a little more readable with more consistent naming

AA branch: fix lower-right bound of frame outlines

CollapsingHeader() fixed label rendering outside in columns context where cliprect max isn't aligned with header

AA branch: CollapsingHeader() rounding down half window padding