Added icons for Management Tube gui
Started work on Diagnostic Tool
* Right click with it on a jammed tube to see what is in it

Fixed Round Robin Tubes bounding box
Fixed Item Filter using wrong NBT tag when loading. Sometimes caused crashes

API Changes:
* Added getOverflowContents to ITubeOverflowDestination
Reduced the recipe for the fluid extraction tube (no reason to be so expensive)
* Now the same as normal extraction tube, but with a bucket instead of hopper
Started work on Advanced Extraction Tube
Added new gui buttons that synch across client-server
* Added IPropertyHolder interface to set properties using just one interface