Physics revamp: New game physics, variable jumping, attacking

[ddh]

Revamped Game Physics

• Implemented new jump mechanics
• Jumping is variable, depending on how long you hold jump key down. Up to a certain threshold anyways.
• Gravity does all the physics work in making goats fall
• Movement is no longer a constant velocity; there is acceleration and friction now
• Collisions have been improved between goat-platforms, goat-goat
• Ability to maintain velocities of goats on moving platforms by utilizing recursive calls to retrieve velocities of any entity beneath
• Goats stack atop of each other great
• Goats can't travel outside of the stage now

Attacking

• Goats can charge their attacks (no animations implemented yet)
• Goats retain their charge power for as long as the attack key is held down
• Goats can attack, by releasing the attack key
• Goats during an attack will dash a short distance; length and power depending on charge power
• Goats during an attack will temporarily suspend all other physics (falling, jumping, movement)
• Collisions between two goats still need to be worked on

Other

• Merged in random hill and scoring with this branch