Quit plugins on exit

Plugins should have a chance to clean up after themselves when we are
shutting down.

libsaria/__init__.py

@@ -65,4 +65,6 @@ def startup():
 
 def shutdown():
 	event.start("PREQUIT")
+	import plugin
+	plugin.quit()
 	event.start("POSTQUIT")

libsaria/plugin.py

@@ -22,6 +22,14 @@ def init():
 	if p_dir == None:
 		p_dir = path.plugin_dir()
 
+def quit():
+	global loaded
+	for mod in loaded:
+		try:
+			loaded[mod].stop()
+		except:
+			pass
+
 
 def install_once(filepath):
 	global install