Fixed EndGroup() not restoring offset properly. breaking SameLine() offset (caused by 954c890) (#829)

Fixing minor english typos (#827)

TODO list

Fixed assert triggering when a window has zero rendering but has a callback (#810)

Examples: Renaming opengl_example/ to opengl2_example/ for clarity (1/2 because git)

ImFormatString() Fixed an overflow handling bug with implementation of vsnprintf() that do not return -1 (#793)

Minor shuffle to ease merging branches. (tentative. fugly but those fields will be removed anyway)

Minor shuffle to ease merging branches.

BulletText(): doesn't stop displaying at the ## mark

Removed a handful of obsolete (trivial) function redirection from 1.34 and 1.38 (march-april 2015) ...

OpenNextNode() -> SetNextTreeNodeOpen()
GetWindowIsFocused() -> IsWindowFocused()
GetItemBoxMin() -> GetItemRectMin()
GetItemBoxMax() -> GetItemRectMax()
IsMouseHoveringBox() -> IsMouseHoveringRect()
IsClipped() -> !IsRectVisible()

Tweak comments (#768)

Merge branch '2016-08-generalized_visibility_test' of https://github.com/thedmd/imgui into thedmd-2016-08-generalized_visibility_test

Using IM_COL32() for colors in a few spots (#767)

Moved GetColorU32 out of imgui_internal.h to avoid inlining mess (#759)

Add ability to test arbitrary rectangle for visibility without need of moving cursor.

Using ImGuiID instead of ImU32 is a few places

SameLine() with explicit X position is relative to left of group/columns (ref #746, #125, #630)

InputTextEx: got rid of unnecessary locals.

InputTextEx(): more shallow tidying up, still being cautious with this function

InputText/IO: Got rid of individual OSX options in ImGuiIO, added io.OSXBehaviors (#473, #650)

InputTextEx(): minor tidying up

InputText(): minor tidying up/simplification following changes for osx style improvements (#650)

Merge branch 'add-osx-homeend-keys' of https://github.com/michaelbartnett/imgui into michaelbartnett-add-osx-homeend-keys

Begin: Moved code that calls FocusWindow() on a newly appearing window lower in the function so that Nav branch can use CursorStartPos on the first window frame. (#323) ...

Pushing in master because it _should_ be a no-op but I'd rather test for any issue in Begin() as soon as possible.

Closing the focused window restore focus to the first active root window in descending z-order (part of #727)

Fixed scrolling offset when using SetScrollY(), SetScrollFromPosY(), SetScrollHere() with menu bar. ...

Tests:
a) add SetScrollY(+20) after Begin("ImGui Demo") test with/without title/menu.
b) add ImGuiWindowFlags_MenuBar in BeginChild() in scrolling tracking demo.

Windows: No default IME handler when compiling using GCC. (#738)

TODO list

InputTextMultiline(): fix so that IsItemActive() can be used afterwards (otherwise the info was lost by using child/group)

InputTextEx: comments (related to #725)