Bug 1210846 Auto Reset Gain & Eq after each song

-Added a checkbox under preferences->equalizers for enabling Auto EQ/Gain
Reset
-If checked, resets the pregain, lowgain, midgain & highgain to defaults when a new
song is loaded
no need to have "ControlObject" as part of the name.  Either CO or just drop it (you don't have it on m_pPreGain for instance)