Set the fontcolor always to black

[Pilot-Pirx]

We should set the fontcolor to black by default.

Some themes on Linux use a slightly different color, for example Ubuntu uses a dark gray.

That drove me mad, because I thought my printer was broken. ;-) At the moment I have set the fontcolor manually to black.

[Pilot-Pirx]

BTW: This can be set manually via "Tools - Options - Appearance - Font color"

[Pilot-Pirx]

It looks like the color of the page border in Writer is linked to the font color. So we end up with a black rectangle on black background in HighContrast mode. I don't understand the logic behind that so I think this PR does not make sense until this is fixed/changed.

[Pilot-Pirx]

Now the page border in Writer is independent of the fontcolor. That means it is black in normal mode and white in High Contrast mode.

[Pilot-Pirx]

Unfortunately there are some more items that use the fontcolor in High Contrast mode. Investigating...