Remove all uniform laying sprites

Created by: dylanstrategie

Basic testing has shown that these are completely useless, the code can manage converting a standing sprite to a laying sprite just fine

Nothing specific has been done to uniform code or uniform sprites beyond deleting all _l sprites. No renaming either

This might be the case for more mob sprites, and thus worth a more thorough check

I shouldn't have slipped up, but I can't realistically check if all of the hundreds of sprites are still here, no compile errors though, that's for sure