Vertical positioning + Autozoom + 2nd fire improvements

Created by: sonninnos

• Vertical offset manipulation changed from minfirstline to thisframe_y_adjust -- Fixes drawn line calculations = more reliable autozooms and autocenterings -- Also fixes interlaced modes statusbar position shifting, like Wizkid

• Changed 2nd fire pull-up resistor behavior, fixing 2nd fire working only once on certain games, like Banshee

As always, testing and reports are more than welcome!