Assign different projectiles to each tower

[sdiaz7]

Definition of Done

• Different towers use different projectile prefabs
• Projectiles are to scale, visible to the player but not exceedingly big.
• Projectile mode is correctly rotated when shot

Estimated 4 Hours

Possible dependencies: #170

[Nerucius]

Done on the same branch as #170 Pull request at #184

[sdiaz7]

Implementation satisfies the definition of done, and has been merged into DEV. I proceed to close the issue and move it to DONE.