Add parameters to peek for use as a call from elsewhere in the game code in addition to being used as a direct command.
Totally random restyling.
Add an iexamine action for curtains that allows peeking through them and tearing them down.
Add translator comments for some potentially confusing strings.
Hoist sight_points up to the caller of overmap_los() to prevent recalculating the sight range repeatedly during draw.
Make sheet roofs foldable.
Merge branch 'its-curtains' of https://github.com/kevingranade/Cataclysm-DDA into merge2
Merge branch 'foldable_sheet' of https://github.com/bdragon28/Cataclysm-DDA into merge2
Merge branch 'overmap_speedup' of https://github.com/bdragon28/Cataclysm-DDA into merge2