Nav: Fixed bad merge of 6def01b so the bug fixed in #840 wasn't fully fixed in Nav branch.

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp

Merged from Navigation branch (DragBehavior)

Merge from Navigation branch: 6aa8019

Merged from Navigation branch. TAB/Alt-TAB processing now deactivate if holding Ctrl.

Merged from Navigation branch (misc)

Merged from Navigation branch

Merged from Navigation branch: ...

f71cdd1  Internal tidying up, moved code to CalcNextScrollFromScrollTargetAndClamp() so it can be reused by upcoming nav code.
c816e6c Fixed SetScrollX() handling of center ratio (which actually wasn't exposed publicly). (#323, #246)

Merged from Navigation branch: https://github.com/ocornut/imgui/commit/5cac4926c82a41253bd3540ce1bb4f50b0cfc146 fix title bar color of window under a modal window.

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp
#	imgui.h
#	imgui_internal.h

Added GetKeyPressedAmount() (from Nav branch) to be able to measure fast repeat rate accurately. Added internal CalcTypematicPressedRepeatAmount() function.

Merge various minor things (supposedly harmless) from Navigation branch into Master to reduce differences. Some code in NewFrame() has been moved around. (#787)

Merge various minor things (supposedly harmless) from Navigation branch into Master to reduce differences. (#787)

Removed duplicate comments

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui_internal.h

RenderRectFilledRangeH() can't use cheap acosf() approximation for now. (#1296)

ProgressBar() fixed rendering when straddling rounded area. (#1296)

Added overcomplicated RenderRectFilledRangeH() to fix rounded progress bar, which will also help for range widgets and perhaps sliders grabs over rounded areas. (#1296, #76)

ImDrawList: Minor renaming

ImSwap() helper.

imDrawList: PathArcTo() returns when passed zero radius.

ImDrawList: Minor tidying up.

Internals: Renamed some ImGuiCorner enums.

ParseFormatPrecision() returns -1 for scientific noation 'e'/'E', RoundScalar() doesn't alter those.

Added Go binding link

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp

Updated copyright date for 2017, updated Gallery link

Internals: Split some code out of NewFrame() into an Initialize() function.

Added IsMousePosValid() helper.

ImFontConfig: Added RasterizerMultiply option to alter the brightness of individual fonts at rasterization time, which may help increasing readability for some. Added RasterizerFlags for custom rasterizer flags (aka imgui_freetype)