Fixed assignment order in Begin() making auto-fit size effectively lag by one frame ...

Also disabling "clamp into view" while windows are auto-fitting

Documentation tweaks and fixes

ImDrawList::AddText() takes a const ImFont*

Fixed bounding measurement of empty groups (fix #162)

ShowTestWindow(): Added simple dragging widget example.

Added CalcItemRectClosestPoint() helper.

ImDrawList: added thickness param to AddLine(). Added PushClipRectFullScreen() helper.

IsItemHovered() return false if another widget is active. Added IsItemHoveredRectOnly().

Added ImGui::GetItemActiveDragDelta() helpers for drag operations

Version number 1.37 WIP

Version number

Added VSliderInt()

ShowTestWindow(): more examples of SameLine() usage

ShowTestWindow(): added vertical sliders examples, tweaks.

Changed mentions of 'box' to be 'rect'

Changed remaining mentions of 'aabb' to be 'rect'

Renamed internal type ImGuiAabb to ImRect

Added BeginGroup() / EndGroup() layout tools (#160)

Added GetItemRectSize(). Renamed GetItemRectMin()/GetItemRectMax()/IsMouseHoveringBox() to GetItemRectMin()/GetItemRectMax()/IsMouseHovering

Button() doesn't add frame padding an explicit size

Maintaining DC.CursorMaxPos instead of SizeContentsCurrent, simpler, faster and easier to understand.

Various fixes related to vertical alignment of text after widget of various sizes. Added demos. Toward #160 ...

Also fixed LabelText() height.

Moved text vertical centering out of ItemSize() for the moment, in TextUnformatted() it's only user

Internal tweaks

Changed default Border and Column border colors to be most subtle, less MS-DOS

Speculative warning fix

Examples: uses SetNextWindowPos/SetNextWindowSize when applicable

Moved static buffers into state ...

No recursion in any of those functions. Tho keeping a lock api may be
preferable?

Moved static buffer into state

TreeNodeV() early out if SkipItems is set (avoid formatting string only to be discarded later)