Optimized driver with drawFastXLine functions

• This release includes a new optimized driver version that includes drawFastHLine and drawFastVLine. Now drawLine uses these for orthogonal lines and for fillCircle, speed has improved a lot.
• These new functions are also exposed through the Graphics object.
• New version of drawLine detects if line is orthogonal and uses the drawFastXLine functions.
• The Dial widget now uses fillCircle instead of fillRectangle to fill the inside of the dial only. With the new drawFastHLine method instead of the older drawLine method, it improved significantly the time it took to use fillCircle.