Hidden text area

[asturur]

Improves iphone focus crazyness on edit
improve japanese input method editor
improve copy cut paste behaviour of internet explorer
improve cut for all browsers ( cut was cutting but not copying )
fixes Shadow not rendered from style object (since we add shadow scaling with canvas)

closes #2823
closes #1985
closes #2839
closes #2773
closes #2740
closes #2859

[asturur]

summary:

Added keyup events, moved "CTRL + Key" combination on keyup so i cancel the event if the textarea consumes the event with other ( real copy and cut )
Added Ctrl+C for copy.
Added compositionUpdate event.
SetShadow was expecting some parameters, we add them at style declaration
Moving the textArea position when editing
managing japanese IME ( and maybe others )