Fixed a bug when closing the 3D view while it is still loading or processing.
Working on adding material settings to 3D view.
Starting to get AMF in as a file type
Unified all the open dialogs to use a common file type list
Made application settings hold the file lists
Made the extruder count a member of ActiveSliceSettings
Made an extruderOffsets mapping
Improved the parameters that we pass to gcode renderer (made them a class)
Made it so we can remove the offsets when rendering multi material gcode
Default to grid on
Extruder offsets are now loadable and savable and editable