Navigation: Renamed ImGuiKey_NavWindowing to ImGuiKey_NavMenu (#323)

Navigation: Can nav-out but not nav-in a window with ImGuiWindowFlags_NoNav flag (#323)

Navigation: comments + moving init block of code above in NavUpdate(), should have no side-effect (committed to simplify next commit) (#323)

Navigation: can't manually focus out of a modal window with controller (#323)

Fixed display of TitleBgActive color on window before a Modal window + modal window availability for navigation (#323)

Navigation: Renaming, shortened some unnecessary long fields names (#323)

Navigation: Moving NavInitWindow() around and making it static (#323)

Navigation: Allow to navigate out of text input with direction or NavCancel (#323)

Navigation: Collapsed window uses ImGuiCol_TitleBgActive when navigation is active (#323)

Navigation: Scoring: Improved directional navigation. Not totally cancelling out dx. Better support for zero-spaced items. (#323)

Navigation: mouse/popup position gets clamped within visible display (#323)

Navigation: Scoring uses rectangle as clipped by parent. Fix selectable extending past parent column among other things (#323)

Navigation: Fixed automatic fallback scrolling from glitching near scroll limits because of miscalculation of SizeContents (#323)

Navigation: Fixed using NavWindowed when a menu is open. (#323)

Fixed tooltip positioning issues when using navigation (#323)

Gamepad/Keyboard navigation support, initial commit, WIP (#323)

Updated code for repeat delay / repeat handling. GetKeyPressedAmount() now returns a count to support fast repeat rate (where DeltaTime > RepeatRate). ...

Renamed from recently added IsKeyPressed() variant to GetKeyPressedAmount(). (no API breakage, added in branch, bbd3b75) (#323)

Added IsAnyWindowFocused(). Renamed IsMouseHoveringAnyWindow() -> IsAnyWindowHovered(), IsPosHoveringAnyWindow() -> IsAnyWindowHoveredAtPos(), IsMouseHoveringWindow() -> IsWindowHoveredRect() for consistency. Kept inline rediection function.

Comment on invalid comment regarding preserving keyboard focus of a closed window, due to commit 19d02be. This is probably still what we want. (followup #727)

DragBehavior: Moving code around, in what should be a no-op, to simplify upcoming Nav diff (#323, #180)

Fixed SetScrollX() handling of center ratio (which actually wasn't exposed publicly). (#323, #246)

BeginChild(): tweak to make the code easier to understand

Style: minor tweak to default color theme to make currently focused window more prominent (#323, #707)

Tab-key focusing inhibited when CTRL is held (#323)

NewFrame(): update activeid data and keyboard before mouse. Should have no side-effects! (So that later we can update Nav between Keyboard and Mouse) (#323)

ImGuiIO: initializing fields in the same order as the declaration.

InputText: don't process keys during the activation frame (this is mostly a workaround to that activation with enter doesn't validate immediately, which is turns triggers an assert in InputScalarAsWidgetReplacement - can't see an issue with changing it this way so trying out) + using local flag clear_active_id to only clear the active id at the end of the frame, which is one of the step that my stash for #701 requires. (#323)

SliderBehavior, RoundScalar: split into separate functions for usage in upcoming nav commits. Testing power==1.0f without fabsf(). Maybe just use == 1.0f as well? (#323)

Popup: Fixed popup initial frame reading MousePos again instead of the value already stored within the CurrentPopupStack in the previous frame. Doesn't make a big difference here, but will do as gamepad/keyboard navigation will set its own popup position. (#323)

Minor bits.