direct: fix a few broken imports

direct/src/controls/InputState.py

@@ -1,7 +1,6 @@
-
-
 from direct.directnotify import DirectNotifyGlobal
 from direct.showbase import DirectObject
+from direct.showbase.PythonUtil import SerialNumGen
 
 # internal class, don't create these on your own
 class InputStateToken:

direct/src/directdevices/DirectFastrak.py

@@ -20,9 +20,9 @@ class DirectFastrak(DirectObject):
     fastrakCount = 0
     notify = DirectNotifyGlobal.directNotify.newCategory('DirectFastrak')
 
-    def __init__(self, device = 'Tracker0', nodePath = base.direct.camera):
+    def __init__(self, device = 'Tracker0', nodePath = None):
         # See if device manager has been initialized
-        if base.direct.deviceManager == None:
+        if base.direct.deviceManager is None:
             base.direct.deviceManager = DirectDeviceManager()
 
         # Set name

direct/src/leveleditor/ActionMgr.py

@@ -1,4 +1,5 @@
 from pandac.PandaModules import *
+from direct.showbase.PythonUtil import Functor
 from . import ObjectGlobals as OG
 
 class ActionMgr: