[Call for review] improvements for linear/axial gradients #120604 and #120957

[Regina Henschel]

Hi all,

I have attached patches to 
https://issues.apache.org/ooo/show_bug.cgi?id=120957 and 
https://issues.apache.org/ooo/show_bug.cgi?id=120604

They change the blending so, that first color is start color, last color 
is end color and they set the number of steps to 2 * <number in UI> in 
case of style 'axial', as discussed here some time ago.

My coding skills are not professional and the Draw module is confusing, 
so please have a look.

Kind regards
Regina