Added emergency sign (inspired by the London Underground)

Made entity properties editable and fixed duping and saving not working!

First version of sprinkler system.

Fixed warp test bugs

Added warp testing on panel

Added 'None' option to sounder sound to allow for strobe only.

Added support for env_fire in heat detector

Found a few US models, which are now implemented. Also added a heat detector

Simplified code, removed a few (too complex) features, and added the possibility of strobe lights!

fire exit sign fix