Allow walkins to be added to Ref. system
Merge remote-tracking branch 'origin/develop' into 66155826-WalkinUI
Add inspector for walkin zone boundary
Add icons for "zone boundary" inspector
Merge remote-tracking branch 'origin/66155826-WalkinUI' into GridView
Merge branch 'GridView' of https://github.com/NREL/OpenStudio into GridView