Adopt some of the newer layout abilities to
clean up the Particle Tool Properties a bit.
- Use in-line check-boxes next to values.
- Use text heading for Preserve toggles and mirror/topology mirror.
Reads clearer. Uses less space. Is more consistent.
Reviewed By: #user_interface, pablovazquez, Blendify, campbellbarton
Ref D10130
eb45e7be47