MCGR: Adapted GradientLinear to make use of MCGR

Added to make GradientLinear work using the MCGR
as 1st of six types. Had to do quite some tickeling
to get it all work, but looks good.

Five more to go, already started to put some things
to tooling to make re-usable for the other types.

Besides adapting this the main change is that the
adaption of defined step-count (versus automatic)
has to be done in modifyBColor now instead of the
back-mapping methods (e.g. getLinearGradientAlpha).

It is still 100% backward-compatible, so as long
as there is no source using this it will stay
invisible - by purpose.

I started to do quite some tests (and fixes/
adaptions in consequence), see the static variable
nUseGradientSteps. If you want to play with this,
you might set it to '1' instead of '0' and use a
linear gradient on an object.

Change-Id: I9d61934defb0674456247f2879f0a89b6a5e50f7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/147413
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

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