Implements modifier system for weapons

Adds a modifier system allowing dynamic modification of weapon
stats and behavior. This includes:

- Creating ModifierLibrary to manage available modifiers.
- Adds ModifierManager to handle equipping and unequipping modifiers
- Adds a new RangedWeaponComponent to handle firing projectiles and
  managing modifiers.
- Introduces a DebugUI for in-game modifier management.
- Introduces an "Unlimited Power" modifier that changes the projectile scene.
- Modifies stats components to work with the new modifier system.

This system allows for more flexible and customizable weapon
functionality.

player/weapons/projectile_base.gd

@@ -21,7 +21,7 @@ var explosion_projectile_speed: float = 300.0
 var explosion_spread_angle: float = 360.0 # Full circle by default
 
 # References
-var source_weapon: RangedWeapon # Reference to the weapon that fired this
+var source_weapon: RangedWeaponComponent # Reference to the weapon that fired this
 var lifetime_timer: Timer
 # Add a variable to track the entity that triggered the explosion
 var ignore_target = []