rewritten using CoreAnimation layers#1

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rudyrichter wants to merge 13 commits intoOomph:masterfrom

Commits on May 18, 2012

support bindings
rudyrichter
committed

Commits on May 24, 2012

expose the disabled state opacity to subclasses and fix it so that mouseDragged is ignored if the control is disabled
rudyrichter
committed

Commits on Jul 29, 2012

moveLeft and moveRight behaviors
rudyrichter
committed

Commits on Aug 23, 2012

retina artwork for the slider control
rudyrichter
committed

Commits on Aug 27, 2012

updates to tmslider to mask the contents to the well, and updated retina art
rudyrichter
committed

Commits on Jan 11, 2013

resolve warnings about float vs CGFLoat

Rudy Richter
authored and
rudyrichter
committed

Commits on Oct 17, 2013

making the slider control slightly more accessible.
Rudy Richter
committed

Commits on Aug 3, 2015

modernization and arc
Rudy Richter
committed

Commits on Oct 24, 2015

warnings and accessibility standards
Rudy Richter
committed