* Canvas:
 - mouse canvas position moved in base IcyCanvas class.
 - 2D mouse image position moved in IcyCanvas2D class.
* IcyTextField : removed the consumeCharKeyPressEvent property.
* IcyFrame: added getInputMap(..) and getActionMap() methods.
* ROI:
 - general performance improvement on draw and mouse events.
 - removed useless mouse position information.
* fixed shift combination shortcuts accidently enabled on text fields.
* better headless support.
* fixed wrong "null sequence" report.
* limited maximum memory to 1024 MB for 32 bits JVM to reduce the
"cannot create native thread" error.
* minors others fixes.