Changed rate drop table mechanic read desc

I've found that rolling for the items in the rare drop table is much too
common as such i've made the rare drop table a roll based chance like
the normal drops. You will have to roll for the rare table then it will
re roll through the items through common - very rare like it would for
main drops

also crawling hand drops matching wikis like i've been doing there drops
are shit now and the 2007/rshelp cant be trusted in most cases but its
better (crawling hands do have rare table access) which is what lead me
to making the above mechanic as i found low maindrop tables with rare
table pushed into the main drops dropped too often