- change the way to make linestitch and birailstitch (trace only one segment by default, remove validation with "return" key)

- uniformise color of every interactive controls of the curves and stitch

  OE_actionScaleSelectedStitchLen
  OE_actionScaleSelectedStitchWidth
  OE_actionSetSelectedStitchPattern
- fix memory leaks when deleting meta actions:
  OE_actionScaleSelectedBirailStitchLen
  OE_actionScaleSelectedLineStitchWidth
  OE_actionScaleSelectedLineStitchLen
  OE_actionSetSelectedLineStitchPattern
  OE_actionSelectionClear

- fix a bug in OE_fillstitch due to error in detection of intersections between some stitch patterns and patch contours

- fix multi cut bug in cutStitches (bad detection of a stitch cut more than once by the contour)

- add fillstitch to loadFromFile method

- move curves handles when we set a grid control point in OE_fillstitch

- add an option to warpStitch method to use 2 lines instead 1 line and 1 normal array

- add some "const" in utils.h

- fix a pan problem (2 time slower than the mouse move)
- add a backgroundColor in displayStyle

- fix a pan problem (2 time slower than the mouse move)
- add a backgroundColor in displayStyle