v1.12 Improved game play

We did a lot improvement on game play and fixed some bugs. Here is the details: 1. We got a lot feedbacks says the game is too hard. So we moved the original hardcore game play to "Expert" Mode, and made some changes to normal and easy mode : - Easy Mode: Enemy's bullet will miss some time, health value incressed. - Normal Mode: Enemies outside your view will not be able to hit you within a few seconds, to give you chance to notice them and respond. - For All Mode: Added a enemy sensor to help you allocate enemy. This is off by default, you have to go to optional panel if you want to turn it on. 2, Fixed the VR hand position bug, now it matchs your real hand position correctly. 3, Fixed a bug : In level 1, Some robot will fall into some weird place where you can not kill them. 4, Improved spawn point of all enemies, for better game experience. 5, Removed the punishment of bullet time when you using locomotion. 6, Expanded the trigger area for switch gun. 7, Added fast turn key, Now you can use your right hand touch pad to quickly turn 45 degress to left/right. 8, Improved the gun fire effect, now it doesn't block your view any more.