player: add protected and suspended members

`suspended' is now for suspending a player's movement input keys;
`protected' is for preventing a player's death except for special cases
such as when health goes below 1 or the player drops out of the world.

To kill a player without checking `protected', use _die().

player/player.gd

@@ -10,6 +10,8 @@ const gear_slots = ["1", "2", "3"]
 
 var starting_gear = preload("res://gears/gear.tscn")
 
+var dead = false
+var protected = false
 var suspended = false
 var direction = Vector3.ZERO
 var target_velocity = Vector3.ZERO
@@ -45,6 +47,8 @@ func message(string):
 # State functions
 
 func harm(hp):
+	if protected:
+		return
 	assert(hp >= 0)
 	_health -= hp
 	make_hud()
@@ -57,7 +61,8 @@ func heal(hp):
 func health():
 	return _health
 
-func die():
+func _die():
+	dead = true
 	suspended = true
 	visible = false
 	$HUD.visible = false
@@ -72,12 +77,17 @@ func die():
 	$RespawnTimer.start()
 	message("Le gone")
 
+func die():
+	if protected:
+		return
+	_die()
+
 func respawn():
 	position = Vector3(spawn)
 	$CameraGimbal.reset()
 	_health = 100
 	visible = true
-	suspended = false
+	dead = false
 
 	# add starting gear
 	var gear = starting_gear.instantiate()
@@ -185,6 +195,7 @@ func do_movement(delta):
 	var mx = 0
 	var mz = 0
 
+	if not suspended:
 		if Input.is_action_pressed("move_forward"):
 			mz -= 1
 		if Input.is_action_pressed("move_back"):
@@ -227,12 +238,12 @@ func _ready():
 	respawn()
 
 func _physics_process(delta):
-	if health() < 1 or position.y <= -1000:
-		die()
-
-	if suspended:
+	if dead:
 		return
 
+	if health() < 1 or position.y <= -1000:
+		_die()
+
 	# Backpack keys
 	do_backpack_keys()
 	# Movement