Assorted device name description fixes from MASH (nw)

git-svn-id: svn://dspnet.fr/mame/trunk@31265 749742ba-7341-0410-aadc-df50b521781e
wicat: added additional boot ROMs [Al Kossow, Barry Rodewald]

git-svn-id: svn://dspnet.fr/mame/trunk@31266 749742ba-7341-0410-aadc-df50b521781e
peplus.c: Documentation corrections, figured out how to find & read the internal paytables and documented this information within the driver. - NW

git-svn-id: svn://dspnet.fr/mame/trunk@31267 749742ba-7341-0410-aadc-df50b521781e
granny: added dips

git-svn-id: svn://dspnet.fr/mame/trunk@31268 749742ba-7341-0410-aadc-df50b521781e
[MAME] New clones added:

Snake Pit (9/14/84) [Dale Luck]

git-svn-id: svn://dspnet.fr/mame/trunk@31269 749742ba-7341-0410-aadc-df50b521781e