ImFont: Renamed ImFont::Glyph to ImFontGlyph (for consistency and so ImFontAtlas types can use it without ordering half of the file). Left a redirection type.

ImFontAtlas: Refactored internals API to 1) avoid building lookup table multiple times for merged fonts + 2) allow the mapping of custom icons inside fonts (wip, uncommited)

ImFontAtlas: Comments and minor reorganization of declaration in header file.

ImFont: Split some building code into a AddGlyph() helper (that custom rect code and imgui_freetype can use)

Merge pull request #1324 from waywardmonkeys/improve-clang-warnings ...

FIxes zealous Clang warning.

Merge branch 'master' into styles

Improve warning configuration for clang. ...

Clang 4.0 introduced -Wdouble-promotion, so check for and disable
that on clang as we do on gcc.

The old style casts warning is already disabled globally in this file
for clang, so it doesn't need to be re-disabled within this scope.

Fixed alloca include for SunOS (#1319)

Don't do a bunch of OS gymnastics. alloca.h is only for glibc, everyone else uses stdlib.h

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

imDrawList: PathArcTo() returns when passed zero radius.

ImDrawList: Minor tidying up.

Internals: Renamed some ImGuiCorner enums.

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)

ImFontConfig: Comments, const.

Version 1.52 WIP

Version 1.51

Merge branch 'master' of https://github.com/ggtucker/imgui into ggtucker-master ...

# Conflicts:
#	imgui.cpp
#	imgui.h

ImFontAtlas::AddFontDefault: Made it possible to override size (even if it isn't really recommended)

ImFontAtlas: Re-arranging code to simplify implementation of imgui_freetype. (#618)

ImFontAtlas: Re-arranging code to simplify implementation of imgui_freetype. (#618)

ImFontAtlas; Re-arranging code to simplify implementation of imgui_freetype (#618)

ImFontAtlas: Draft of an api to submit custom rectangle (not exposed). Atlas default texture chunk using it. (WIP: we are still storing mouse UV outside in GImGui)

Merge branch 'master' into styles ...

# Conflicts:
#	TODO.txt

ImFontAtlas: Some shallow renaming + added an assert for clarification

ImFontAtlas: Shuffling some code inside Build() to make upcoming diffs less confusing (nb: we might break compat with forks of Build() like #618)

Whitespace fix to previous

Make font atlas packing padding configurable