[Tilesathome] Colour reduction

[Philip Shipley]

> I guess number of colors used in stylesheets is huge right now so I
> would prefer to simplify stylesheets and reduce number of colors
> first.
>

There are around 130 colours defined in z17, before the antialiasing kicks in.

Some could very easily be retired, as examples

f7f7f7 & f8f8f8, 606060 & 666666, f0f0f0 & f2f2f2

Now I know my eyesight is not the best, but I can't tell the
difference between these pairs.

I also recall reading somewhere that antialiasing should only be on
for text, but I haven't tried it. However given that some of the
casing is very 'thin' I suspect the results might not be too great.

Regards

Phil