Added animations

Finally figured out how to get animations working, sort of, for now.
Will need to look into Sprite Sheets in the future.

Added Animator component to the player's body component to handle
animation states, no transitions yet.

Added art and anim for Squint.
Added anim for Idle
Added anim for HoldingItIn
Removed old player_test png that's not necessary any more.
Added script to handle changing animation state.

Updated script naming conventions: now the different sections' function
names start with the name of the section 'Launch_', 'PullLine_',
'Animation_' etc.