cleanup gaps patch
make gap size configurable per workspace
Improve error message when a full_text property is missing
added explanation for new gaps functionality
Merge branch 'feature-gaps-per-workspace' into gaps
Merge remote-tracking branch 'origin/gaps' into gaps-next
Merge remote-tracking branch 'i3-original/next' into gaps-next

Conflicts:
	i3bar/src/child.c