Offer path minification

[ccprog]

Please do not comment yet. This is only a short draft before going to be bed.

Offer optimization of path data.

Do not use svgo, it is evil. Only the EBNF of SVG1.1 is the meausre of success. (In case you missed it, the EBNF in SVG2 has been simplified in a way that is unhelpful.)

• boolean minification
• superfluous z if start and end are identical and there is a L H V at start or end. Moving the start point if neccessary and possible.
• If it is in any way doable, get back to A if it is a conversion to C. Yes, I know it was a lossfull conversion in the first place. But I know I can do it by hand and with a good eye. And yes, it may proove impolssible.
  What is more interesting is proof whether it really shortens the string.
• correcting obviously wrong viewBox. The same comment as above applies.

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