ENYO-2236/3151/2237: [DO NOT MERGE] Key related work.

Adds sample key binding algorithm.

 - Insert key press algorithm for future work.
 - Not focused on ace editor, 'Ctrl+X' will exit the current editing file.

ENYO-2236: As an app developer, I can use the hotkeys on Designer / Code Editor / others
Enyo-DCO-1.1-Signed-Off-By: SangHyun.Hong (sanghyun.hong@lgepartner.com)