Merge branch 'is-popup-open' of https://github.com/mkeeter/imgui into mkeeter-is-popup-open ...

# Conflicts:
#	imgui.cpp

Whitespace fix to previous

Make font atlas packing padding configurable

Style: Moved position of ImGuiCol_TitleBgCollapsed

ImVector: added resize() variant with initialization value

Revert d2c219d #826 + tidying up ImFont::RenderChar()

Merge pull request #826 from swetland/patch ...

ImFont: add RenderGlyph() to allow rendering of individual glyphs post-query

Style: Moving code in a function to make incoming diff easier to parse.

Style: renamed ImGuiCol_Columns_*** to ImGuiCol_Separator_*** (BREAKING), Separator() uses this color as well. (#707, #1019)

Fonts: Adding references to the fact that .OTF fonts are supported (but haven't renamed the entry points)

Documentation tweaks

Renamed ImGuiSetCond_XXX type and enums to ImGuiCond_XXX, kept old enums under #ifdef IMGUI_DISABLE_OBSOLETE_FUNCTIONS

Removed old ValueColor() helpers. (#346)

Added ImFontAtlas::GlyphRangesBuilder helper + doc

Added SetColorEditOptions(). ColorPicker4: context menu to select picker type and alpha bar. Reorganized flags (again!). (#346)

Moved ColorEdit, ColorPicker declaration in their own section of imgui.h, minor comments adjustment (#346)

ColorPicker: Hue wheel + SV triangle picker mode (mode selection flags still wip, missing context menu and persistent options). (#346)

Renamed ImGuiColorEditFlags_ModeMask_ to ImGuiColorEditFlags_InputsModeMask_ (#346)

ColorEdit4: Preliminary support for ImGuiColorEditFlags_HDR flag (currently only lift limits). (#346)

ImGuiColorEditFlags: Made 0x01 unused for backward compatibility with old bool. Various comments tweaks. (#346)

Renamed ImGuiColorEditFlags_NoColorSquare to ImGuiColorEditFlags_NoSmallPreview (#346)

ColorPicker: Added ImGuiColorEditFlags_NoSidePreview flag + optional reference color. Added more demo code. (#346)

ColorEdit, ColorPicker: AlphaPreview, AlphaPreviewHalf are explicit. Updated demo and using in style editor. 3x3 checkerboard more readable in half mode. (#346)

ColorButton: ImGuiColorEditFlags_HalfAlphaPreview flag to render both opaque and alpha-with-checkerboard versions of the peak preview (#346)

ColorEdit, ColorPicker: added ImGuiColorEditFlags_NoAlphaPreview flag (#346). Reorder flags again.

Comments

Added GetColorU32(u32) variant that does the style alpha multiply without a floating point round trip. Not 100% sure about that before the signature may seem ambiguous? But also make using imgui+drawlist more consistent in end-user extensions.

Reorder ImGuiColorEditFlags_ (#346)

ColorEdit, ColorPicker: Context / options menu allows to toggle between u8 and float display. Using short words to avoid localization. (#346)

ColorEdit: Added ImGuiColorEditFlags_Float flag to display and edit drag values in 0.0..1.0 range instead of 0..255. (#346)