Finished up work for Printer Connection Window and PrinterList Items.
Merge pull request #77 from gregory-diaz/development

Finished up work for Printer Connection Window and PrinterList Items.
Merge remote-tracking branch 'origin/development' into development
Put in a group button and made it work.
Merge branch 'development' of https://github.com/MatterHackers/MatterControl into development
Merge pull request #78 from jlewin/fixes

Additional updates to Queue
Make sure we are on T0 before we start printing.
More allocation validation.
Widened the print connection buttons a bit and made a separate part preview container widget.
Added feature to replace "Default Printer" with the Make and Model of the printer if the name of the printer was not changed when added
Merge pull request #79 from mmoening/development

Added feature to replace "Default Printer" with the Make and Model of th...
Fix bug when closing preview window popout.
Merge remote-tracking branch 'origin/development' into development
fixed the escape key to cancel a drag in 3d.
Merge remote-tracking branch 'Greg/development' into development
Made the part window close right.
Updated setting for new airwolf models.