Feature bullets

[hsravat-4590]

This Pull Request adds shooting mechanics to the game and closes issue #121

Added

• Handgun which knocks off 5 health points
• Weapon Switcher
• New AttackVector Prefab Framework for simpler weapon creation/integration
• Allow teams to have their own weapon sprites
• Weapon Switching Feature

Changed

• Melee weapon made into AttackVector type

Deprecated

• PlayerAttack has been deprecated. See AttackVector and WeaponManager

[hsravat-4590]

TODO

• Player sometimes is able to Melee Themselves
• At the start of a game, all weapons (all sprites) are enabled