new command "inset"
added comment
#10: remove gap_size and inset and replace with unified gaps command
#10: use 'set' instead of no keyword
Merge remote-tracking branch 'origin/gaps' into feature-inset-workspace
#10: updated readme
#10: new screenshot
#10: new screenshot
Merge remote-tracking branch 'origin/gaps' into gaps-next

Conflicts:
	include/data.h