Fix bug in UM2 firmware where the abort print did not home the head. Added option to open the save location after saving an GCode file.
Make fix horrible type A default.
Fix #602
Add base height to image loader.
Add the machine settings option to the machine menu.
Set the new minimal-extrusion-before-retraction default.
Disable the steppers after finishing printing.
Update the changelog.
Added keyboard control for the 3D window to look around with cursor keys.
Merge remote-tracking branch 'remotes/daid/SteamEngine' into Extensio