Improve overall weapon system

[danilko]

As a player, I want to have more weapon to choose and better weapon switch system

Included but not limited to

• Implement Weapon Type - Machine Gun type effects #18
• Implement Weapon Type - Multi - Missile Launcher #17
• Implement Weapon Type - Remote Weapon #27
• Better effects of overall system
• Small damage projectile weapon but reload faster
• Implement effect for reducing all weapon loading time for a easy to debug behavior (such as able to purchase engine)

For UI

• Better UI to recognize current weapon status while not distract player
• Research and implement better user system

[danilko]

Also change overall projectile from raycast + area2D to pure Area2D again.

As it seem with godot 3.3.4, the Physics for Area2D are much more accurate alone.

This allows better performance for browser based export.