indicate homed status

[ronlawrence3]

@BarbourSmith - a simple update to indicate the homed status of the maslow based on my $MINFO command.

I intend to remove this message in favor of making the maslow tab UI react to the state and present options but for now this may help users see that they need the re-hang dance.

[BarbourSmith]

I 100% agree with the need to address this issue, but is there any way we could make something a little more polished feeling? I'm not 100% sure what that would be.

Maybe a popup if the arrow buttons are pressed when the machine is not homed?

[ronlawrence3]

Yep, I agree. This was a "quick and dirty" to accomplish just notification to people that the thing is not homed... My current branch is working on a UI where if the machine is not homed, it walks the user right through the "rehang dance" (no, I don't call it that :) ) . I'll just take the time to get that on this PR and @ you again when its ready. I'm still working on allowing Z and config dialogs to open from the wizard..

[BarbourSmith]

Merged in #33 in a slightly modified form so that I could get it into this week's update. Great work!