Change newly introduced Clip* functions to ClipAndDraw

A number of new clipping functions have been introduced, but to make
it more clear as to their purpose they have been renamed. They are:

+ ClipGradientToBounds -> ClipAndDrawGradientToBounds
+ ClipGradient -> ClipAndDrawGradient
+ XORClipGradient -> XORClipAndDrawGradient
+ ClipGradientMetafile -> ClipAndDrawGradientMetafile

Change-Id: I2448a62d0473501a8d2613e685ee909cb6df7708
Reviewed-on: https://gerrit.libreoffice.org/8878
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>