imgui_freetype: Minor tweaks and comments.

ImVector: Added size_in_bytes() helper.

ImFontGlyphRangesBuilder: Using 32-bits fields for storage instead of 8-bit ones, comments, todo.

ImVector: Made reserve() another silly one-liner. It's not longer than other functions and our weird obsessions deserve to be carried with stringent consistence. + Comments

ImVector: Made a struct. Using T/T* in the code instead of value_type/iterator. Renamed index_from_pointer() to index_from_ptr() (was not documented, added in 1.63, users not supposed to use ImVector, hopefully not a big deal).

Internals: Added comment index in imgui_internal.h

Update link to Magnum bindings. (#2269) ...

The various community projects that integrated Dear ImGui into Magnum
were merged together and are now an official part of the engine.

Minot internal tweaks, comments

ImDrawList: Optimized some of the functions for performance of debug builds where non-inline function call cost are non-negligible.

Internals: LowerBound: Use raw pointer typedefs, we never use iterator anywhere else in the codebase. ...

Demo: Typo.
C98 fix.

Added IMGUI_USE_STB_SPRINTF (undocumented) (#1038)

Tests: Reworking hook prototypes for imgui-test to be faster and multi-context friendly.

Selectable() should have an ID even though they are disabled, to be consistent with other widgets. Not sure of the reasoning ~1.41 which made this turn to 0.

Fixed animated window titles from being updated when displayed in the CTRL+Tab list. + Adding overkill helpers for reusing buffers. (#787)

Tabs: Added ImGuiTabBarFlags_NoTooltip flag. (#261, #351) + added helpful assert

Demo: Log: Comments. Using clipper. Not linking with rand() anymore.

Tweak changelog + tweak internal render helper functions.

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

Comments/formatting on obsolete stuff

IO: Renamed InputCharacters[], marked internal as was always intended. AddInputCharacter() goes into a queue which can receive as many characters as needed during the frame. This is useful for automation to not have an upper limit on typing speed. Will later transition key/mouse to use the event queue later.

Moved ImVector higher up in imgui :( because we will need it in ImGuiIO.

Added alternative Rust bindings

Nav: Fixed an keyboard issue where holding Activate/Space for longer than two frames on a button would unnecessary keep the focus on the parent window, which could steal it from newly appearing windows. (#787)

Added bindings in Readme. Added internal IMGUI_DEBUG_LOG() helper. Comments, missing breaking changes note relative to imgui_impl_xxxx changes, not really part of core but worth adding in the imgui.cpp breaking change section.

Examples: Allegro 5: Properly destroy all globals on shutdown. (#2262)

Added sanity check to debug parent/child ordering issues (they would generally manifest with an assert/crash in EndFrame bu tthis assert will catch some earlier).

Natvis: Added Hidden info about ImGuiWindow.

Examples: Downgrading projects to xcode 9.2 (maybe 8.0) (#2134) ...

* example_apple_opengl2: The deployment target was set to 10.12 from XCode 9.2.
* imgui_impl_metal: header not found by XCode 9.2.
* example_apple_metal: The deployment target was set to 10.12 from XCode 9.2.

Moving issue/pr template to docs/. Added links in README.

Internals: Extracted code out of EndFrame() into UpdateMouseMovingWindowEndFrame()