-Fixed bug where shield would stop working after map transition/change

-Fixed bug where shield wouldn't work in multiplayer or local servers, thanks to datae once again.

-Changed cooldown to 33 seconds so players cannot spawn a new shield as soon as their old one is gone(Better for balance). Suggested by Murvivi, thank you!
-Added a sound that plays when the cooldown is over

-Fixed bug where the entity was completely broken because my stupid self used a model that I thought was a hl2 model but was actually a model from one of my addons. Big Thanks to datae, Khureon and Murvivi for pointing this out and helping to fix it. Phew!

-Removed need for contextual animations(Thanks to datæ)
-Added cooldown on the cooldown sound so players cant spam it
-Optimized code a bit
-Added some more comments/refined existing ones

Initial addon creation.