features performance enhancements
1. reusue entity.geometry where possible
2. cache entity parents
Don't show "0 Hidden Features" warning after editOff
(regressed in 916a901)
Move editable() to be with the other map things
Initialize radialMenu earlier
This prevents it from being undefined when exiting back to browse mode:
  in selectElements() (re 2024e233 crash if element id passed in url hash)
  in update() (possible re #2151?)