Adds telescopic riot shields

- HoS shield (the one that spawns in his locker) replaced with telescopic shield
- More can be made from research (they're very pricy though, and start in lockboxes)
- Buffed force of riot shield bashing
- Lowered throw range of riot shield
- Increased throw force of energy shield when activated (captain america!)
- Changed e-shield so you can throw it further and faster when it's deactivated

Telescopic shield:
- Identical stat-wise to normal riot shield
- Collapses like an e-shield for easy storage in backpacks
- Fits on back as well if carrying your shield on your back is your kinda thing

![ss 2014-10-04 at 03 47 24](https://cloud.githubusercontent.com/assets/7247232/4517061/6dc4fce8-4c1a-11e4-91f1-cfdb1430bf0a.jpg)
![ss 2014-10-04 at 03 47 18](https://cloud.githubusercontent.com/assets/7247232/4517063/709e7b6a-4c1a-11e4-8265-76e4e91c78b3.jpg)

Sprites mostly by Allura/quilty.
No because that updates the item_state as well since the item_state is null