Started fps system

scripts/weapon_system/usable.gd

@@ -0,0 +1,25 @@
+@abstract
+extends Node
+
+class_name Usable
+
+var system: WeaponSystem
+var in_use: bool = false
+
+@rpc("authority","call_local","reliable")
+@abstract func use_begin() -> void
+@rpc("authority","call_local","reliable")
+@abstract func use_end() -> void
+@abstract func alternate_state() -> void
+# Need to clarify naming; Switch mode like firemode. For different states use
+# alternate_state
+@abstract func switch_mode() -> void
+
+func enter() -> void:
+	pass
+func exit() -> void:
+	pass
+func update(_delta: float) -> void:
+	pass
+func physics_update(_delta: float) -> void:
+	pass