0.55.5070 - Vacuum fixes

Small update:

A significant fix to vacuum cleaners behavior, now they will go to the nearest item properly, not skip items that are placed close to walls. Especially important for the recently-added vacuum stealer trap - so that vacuum stealers will actually pick up the stuff that got dropped.

Also there are 3 new tilesets :)

Full changelog:

• 3 new tilesets
• Significant improvement of vacuum cleaners behavior
• Change a letter in mimics’ names
• Fix metal chest mimic name
• Fix nude top spirals incorrectly marked as covering top