[Do not merge] Generic Paint

-Paint can now be made on the station via plasticide;
-Paint colours objects and turfs via splashing, coating, spraying or foam;
-It takes the colour of whatever is in the same beaker, mixing them with other paints and reagents;
-Orderable paint uses this system;
-Paint removal can is removed, janitorial tools now work;
-remove_any is rewritten and makes sense now.

Do not merge this yet: though tested, it can use some finishing touches.