Patch notes for Beta 1.2.4

Atriums are pretty much finished, but I've decided to add support for balconies as well, which will take a little while longer to finish.

Changes

• Added glass and railing type fences

Fixes

• Fixed splitting room with rectangle room tool being more expensive than using free angle tool

• Fixed quarter turn stairs that wrap around wall mistakingly being re-parented to adjacent room on load

• Fixed bugged insulation calculation from last patch