Item Pickup

Player can now pick up items and carry them around in his hand.  Right
click picks an item up in right hand, left hand - left click, middle
click - drop both.
Look at the player in scene view, can see it happening better. Need to
stand about a meter away and have an item directly in the centre of the
screen.
HUD and Camera Fade

Added in a HUD element to indicate an item is able to be picked up, and
also a camera color fade effect.  Also added in some new controls, C
will turn the cursor off and on so its easier to walk around and select
things, and F will trigger a camera fade in.
Forgot to prefab a few things