Move interactable input handling into Player2D so we can selectively block it from working if OldComputer is open

We probably could have special-cased that check in Interactable now that I think about it

interactable.gd

@@ -7,7 +7,7 @@ var checked_teleport
 var telecam_speed_mult = 4
 var enabled = true
 var cooldown = 2
-var is_interactable = false
+var _is_interactable = false
 
 func disable():
 	enabled = false
@@ -17,10 +17,12 @@ func enable():
 	enabled = true
 	$Sprite2D.modulate = Color.WHITE
 
-func _process(delta: float) -> void:
-	if not (is_interactable and Input.is_action_just_released("interact")):
-		return
+func is_interactable() -> bool:
+	return _is_interactable
 
+func interact() -> void:
+	if not is_interactable():
+		return
 	interacted.emit()
 
 func _physics_process(delta: float) -> void:
@@ -29,11 +31,13 @@ func _physics_process(delta: float) -> void:
 func _on_approach(body) -> void:
 	if body!=%Player2D:
 		return
-	is_interactable = true
+	_is_interactable = true
+	self.add_to_group("nearby_interactables")
 	$Sprite2D/ButtonPrompt.show()
 
 func _on_abandon(body) -> void:
 	if body!=%Player2D:
 		return
-	is_interactable = false
+	_is_interactable = false
+	self.remove_from_group("nearby_interactables")
 	$Sprite2D/ButtonPrompt.hide()