Visual Mode: fixed an issue where trying to apply a rotation to things that were not seen yet would cause a crash

Fixed a problem where not selected geometry and things could not be dragged when the "don't move selection if any part of it is outside of map boundary" option was enabled

3D Floor Mode: fixed an issue where new control sectors could not be created if any sector's bounding box completely encompassed the Control Sector Area

In Sound Propagation Mode you can set the start (default: Shift+S) and end (default: Shift+E) sectors between which a path the sound can travel will be found and displayed.

Visual Mode: fixed a problem where the selection order was not kept when synchronized selection between visual and classic modes was enabled. Fixes #938

Visual Mode: fixed a problem where things directly touching the top of 3D floors were rendered with the incorrect brightness. Fixes #940