Reimplement !drain command

mosfet/commands.py

@@ -57,7 +57,7 @@ class Commands:
 
         unsupported = {
             'gather', 'loiter', 'trade', 'gapple', 'cache', 'fill',
-            'drop', 'dump', 'drain', 'break', 'open', 'click', 'use',
+            'drop', 'dump', 'break', 'open', 'click', 'use',
             'interact', 'respawn',
         }
         if (command in unsupported or
@@ -473,8 +473,8 @@ class Commands:
 
                 ## 1drain - drops all items in inventory
                 if command == 'drain':
-                    self.g.draining = True
-                    reply = 'ok'
+                    count = self.g.game.start_drain()
+                    reply = 'ok' if count else 'empty'
 
                 if command == 'gapple':
                     self.g.job.state = self.g.job.find_gapple