ImFontAtlas: Rewrote FreeType based builder. ...

- Fixed abnormally high atlas height. (#618)
- Fixed support for any values of TexGlyphPadding (not just only 1). (#618)
- Atlas width is now properly based on total surface rather than glyph count (unless overridden with TexDesiredWidth). (#618)
- Fixed atlas builder so missing glyphs won't influence the atlas texture width. (#2233, #618)
- Fixed atlas builder so duplicate glyphs (when merging fonts) won't be included in the rasterized atlas. (#618)

imgui_freetype: Minor tweaks and comments.

Renamed ImFont::GlyphRangesBuilder to ImFontGlyphRangesBuilder. Keep redirection typedef (will obsolete).

Natvis: Added Hidden info about ImGuiWindow.

Added link to experimental imgui_scoped.h PR/thread (#2197, #2096)

Font readme: Added OpenFontIcons, tweaks, links, removed spaces (#2141)

Fixed typo in misc/README.txt (#2131)

Renamed misc/stl/imgui_stl.h,.cpp to misc/cpp/imgui_stdlib.h in prevision for other files.(#2035, #2096) ...

Added misc/README file.

InputText: Clarified comments around ImGuiInputTextFlags_CallbackResize and other callbacks. (#2006, #1443, #1008)

Added Fonts readme details and links to Sweet16 font. (#2085)

Internals: Replace unsigned short with ImWchar when dealing with character storage (missing cases) + in imgui_impl_ file keep using neutral type everywhere, added missing explicit cast in three bindings. (#2078)

Renamed stb_truetype.h to imstb_truetype.h, stb_textedit.h to imstb_textedit.h, and stb_rect_pack.h to imstb_rectpack.h. (#1718, #2036) ...

If you were conveniently using the imgui copy of those STB headers in your project, you will have to update your include paths.
The reason for this change is to avoid conflicts for projects that may also be importing their own copy of the STB libraries. Note that imgui's copy of stb_textedit.h is modified.

imgui_stl: Comments (#2035)

Documentation

InputText: Improved sturdiness if the ResizeCallback purposefully modify data->BufTextLen or data->BufSize. (#2006, #1443, #1008)

Added optional misc/stl/imgui_stl.h wrapper to use with STL types (e.g. InputText with std::string). (#2035, #2006, #1443, #1008)

Examples: Cast to ImTextureID instead of void* when assigning to TexId. Applied to all examples. (#2015)

ImFontConfig: Added GlyphMinAdvanceX/GlyphMaxAdvanceX settings useful to make a font appears monospaced, particularly useful for icon fonts. (#1869)

Readme, FAQ tweaks (#1807)

Fixed documentation example (#1847)

Documentation: FAQ, ID Stack, Fonts (#1839, #1840), #1842)

Version 1.62 WIP

imgui_freetype: skip missing glyphs as well to match our stb loader (#1671, #1703)

Comments, minor tweaks

Documentation bits. Misc comments.

Misc comments, todos + reintroduced removed ImGuiCol defines under !IMGUI_DISABLE_OBSOLETE_FUNCTIONS wrap.

ImFont: Added FindGlyphNoFallback. Fixed MergeMode broken by 1ef1acb

Font: Fixed MergeMode adding duplicate glyphs data instead of reusing existing (broken by 072d6d8)

Comments, moved ImFontAtlas::Flags to "public" area.

ImFontAtlas: Added ImFontAtlasFlags_NoPowerOfTwoHeight, ImFontAtlasFlags_NoMouseCursors flags. (#1613)