Janitor/Wire/Hydro Sprite Stuff.

-Adds janitor cart sprites for pete. Removes trash.dmi and merges it with janitor.dmi.
-Moves the 8 separate wire .dmis and puts them in their own folder.
-Moves plants.dmi into the flora folder.
-Adds sprites in hydroponics-related .dmis for my upcoming project. Greatly cleans up hydroponics.dmi
Merge pull request #178 from Cheridan/master

Janitor/Wire/Hydroponics Sprite Stuff