Added RenderCheckMark() helper following the font size ...

Pretty ugly, not sure what's the right way to solve that automatically,
better shown as an "icon" so it doesn't have to necessarily look like
the font.

Removed style.AutoFitPadding, using style.WindowPadding makes more sense (the default values were already the same).

Comments, tweaks, metrics window tweak

Tooltip: fit within display. Added style.DisplayWindowPadding, style.DisplaySafeAreaPadding now strictly for popups/menus.

Comments

Added IsKeyDown() IsMouseDown() as convenience instead of reading into IO structures ...

Also their existence serves as implicit documentation of what
IsKeyPressed(), IsMouseClicked() does

Added ImGuiStorage::GetVoidPtrRef()

Version number 1.39 WIP

Removed comment

Added DragFloat2, DragFloat3, DragFloat4, DragInt2, DragInt3, DragInt4.

Version number 1.38

fix outdated documentation

Renamed IsClipped() to IsRectClipped(). Kept inline redirection function (will obsolete).

Added IsItemVisible(). Made IsClipped() also return false when log is enabled.

Added ResetMouseDragDelta() for iterative dragging operations

Added PushId() GetId() variants that takes string range to avoid user making unnecessary copies

DragFloat() added power parameter for logarithmic drag on both side of zero #180

DragFloat() latch value internally, allows finer control, honor precision settings, slow step with integer works #180

DragInt() step given as float to allow finer control of speed #180

DragFloat() latch value internally, allows finer control, honor precision settings, slow step with integer works #180

Added ImFontAtlas::AddFontFromCompressedTTF() helper + binary_to_compressed_c.cpp tool

ImDrawList: bits of renaming.

Renamed io.MetricsVertices to io.MetricsRenderVertices

Spacing

ImDrawList: internal refactoring toward a following commit for indexed rendering.

Renamed AddArcFast() parameter 'tris' to 'filled'

Revert AddArcFast()->AddArc(), removed modulo from function 200d348

Renamed ImDrawList::AddArc() to ImDrawList::AddArcFast() for compatibility with future API, and changed 2*PI range from 0..12 to 0..16

fix initialising ints with float literals

Added ShowMetricsWindow()