Update input_plugin.c

Code cleanup and adding sane inputs for Bio F.R.E.A.K.S., Clay Fighter 63 1-3, Clay Fighter - Sculptor's Cut, Dark Rift, Mace - The Dark Age, Mischief Makers, Yuke Yuke!! Trouble Makers, Rakuga Kids, Rampage - World Tour, Rampage 2 - Universal Tour, War Gods and Xena - Warrior Princess - The Talisman of Fate.
Merge pull request #20 from Oggom/master

Code cleanup and adding sane inputs for more games