- prevent editbox from recalculating its textbreaking each frame
- let spinbox react on each textchange without waiting for enter to prevent getting value changes without corresponding 
EGET_SPINBOX_CHANGED events.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2411 dfc29bdd-3216-0410-991c-e03cc46cb475