Sanitizes the item names in the smartfridge interface, so single-quotes no longer render items un-vendable.  Applies to chem and virology fridges as well.  Fixes issue #3973

Also uncomments the power_change method so the fridges use the unpowered sprite when appropriate.
Merge pull request #4117 from Rolan7/Issue_3973

Smartfridge item name sanitation and unpowered icon fixes