Bug squashing adventure: Patch one

Hey folks, this patch brings an assortment of fixes to bugs that have plagued us for far too long.

In no particular order, we have:

• A fix for the bug where hide-volumes that are created in empty zones were not saved
  
• A fix for a case where board deserialization taking multiple frames could result in a crash
  
• Fixed the scroll direction of the slider on the atmosphere panel
  
• Stopped sending send chat messages if they have a length of zero
  
• Started disabling all animators on asset load. This stops doors opening when being placed and props from animating when turned into creatures.
  
• Fixed a bug in hide-volumes where deleting volumes and switching boards could result in exceptions that stopped all hide volume UI from working
  
• A tweak so that sampling assets from the board now updates the highlighted category button in the UI
  

We hope to squash a bunch more bugs over the next week.

See you in the next patch!