Tweaks so elevation measurement works with Elevation Ruler.
Fix for manual elevation change failing when autoelevate tokens is enabled. Closes issue #105.
Fix for #104 (cannot see over walls). Fixes shadows incorrectly sized because point source elevations were getting set to 0 incorrectly.
Fix for Color Picker registration failing, causing setting elevation to fail. Closes issue #107.
Update geometry lib to 0.2.17.
Full Changelog: 0.5.12...0.5.13