Selectable() render into AutoFitPadding only when full-fitting (fix aac9981)

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

Version number 1.38

ShowTestWindow(): drag example + tooltip.

Slider internals: removed unnecessary slider_bb parameter

ShowTestWindow(): added a custom label in the format for one of the slider example.

Columns: mouse dragging uses absolute mouse coords. Fixed dragging left-most column of an auto-resizable window. #125

Active column (when dragged) not clipped so it can release its active state (extends 16ddd79)

Documentation

DragFloat, DragInt: if step/speed is zero defaults to 1% of range #180

Merge pull request #199 from bkaradzic/master ...

Fixed C4267 size_t to unsigned int conversion warning.

Fixed C4267.

ShowMetricsWindow(): renaming locals (not sure about the "shadows a local variable" warning?)

Fixed warning: missing initializer for member.

Fixed: warning: declaration shadows a local variable

Fixed: warning: missing field 'w' initializer [-Wmissing-field-initializers]

TODO list

Fixed hovering over a popup's child (popups disable hovering on other windows but not their childs) #197

Tweak date/credits

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

Remove stray tabs

Comment on the newly added binary_to_compressed_c.cpp helper program

Fixed prototypes