RBY/Stadium Mechanic Fixes

Aurora Beam and Bubblebeam rate corrected
Haze cures major status in Stadium
Sub blocks status in Stadium
Mimic should not copy an already known move in Gen 1.


Explosion should always faint and Hyper Beam should always recharge in Stadium, however, I could not get these to work. I'm hoping its something minor I missed, but neither of the changes have any effect (negative or positive) against the moves

I put comments on everything I changed (bar the effect chance) to let others know what has been discovered