Buffs and Tower Ideas

New Towers:

Life Tower = Adds 1 Life per squirrel kill (10% chance of happening) for
every Life Tower placed.

Resource Tower = Multiplies the amount of resources given by the number
of Resource Towers placed.

Updated GameScreen.java to display the amount resources the player
currently has and the amount of life they have left.

I didn't know we were planning to use a Stone resource as well but that
shouldn't be hard to include (if we do include it).

Clicking the "Done" button gives 100 resources for testing purposes.

Buffed the amount of damage Stick Towers do (2 -> 5)
Buffed the reward of basic Squirrels (2 -> 5)

Messed around with MaxTower to see how powerful we really can make the
towers.