fix outdated documentation

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

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

Active widgets is not clipped, so it can always release its active state (mentioned in #143) ...

Otherwise a change in layout moving active widget to a clipped region
may lock the active id.

Added ResetMouseDragDelta() for iterative dragging operations

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

DragFloat() fixed clamping #180

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

Remove stray tabs

Comment on the newly added binary_to_compressed_c.cpp helper program

Fixed prototypes

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

Examples: DirectX11: tidying up.

ImDrawList: Minor optimisation.

Warning fix.

Examples: OpenGL3: Tweaks (argh, github ui)

Examples: OpenGL3: Tweaks.

Examples: DirectX11: Removed unnecessary vertices conversion and CUSTOMVERTEX types.

ImDrawList: bits of renaming.

Renamed io.MetricsVertices to io.MetricsRenderVertices

ImDrawList: inline AddVtx() calls for profit in highly debug builds

Spacing

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

Tweaks.

Fix rounded frames to follow previous change

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

Merge branch 'master' of https://github.com/ocornut/imgui