Merged revisions 4001-4056 from 1.7 branch. Keycode updates, fix compilation errors, vector normalize error case fixed, joystick safety fixes, editbox updates, meshviewer modal window fix, isPointInsideFast changes.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4057 dfc29bdd-3216-0410-991c-e03cc46cb475