Add key config to Settings Window for Entity Editor movement

Basic Key configuration - also adding UITabs 
@ivansafrin hope it's kind of the way you had imagined :smile:
![image](https://cloud.githubusercontent.com/assets/5982050/3421132/8e3e4954-fed9-11e3-9f73-ff971cecbb99.png)
![image](https://cloud.githubusercontent.com/assets/5982050/3421135/af2f262e-fed9-11e3-96e5-916e3ed290e0.png)