Font/Graph, {Font, Glyph}/Typecast: Add kerning and expose values in original font-units (FU) to have them scaled later ( fu * pixelScale / unitsPerEM )

Scaling from font-units (funits, or FU) is now performed by the renderer itself,
i.e. applying the scale-factor 'fontPixelSize / font.getMetrics().getUnitsPerEM()'
to the PMV matrix to render the whole graph GLRegion.

This finally provides proper device and resolution independent font utilization.

Further, preliminary kerning has been added.

+++

Also ...

TypecastFont:
- getGlyphID(..) getGlyph(..) enforce symbol mapping to Glyph.ID_SPACE Glyph.ID_CR,
  as some fonts ave an erroneous cmap (FreeSerif-Regular)

- add getKerning(..)
  TODO: Add binary search

- Set TypecastFont.USE_PRESCALED_ADVANCE := false,
  i.e. dropping all prescaled pixel-sized advance values mapped to font pixel-size
  as we utilize font-units only for later uniform scaling.

- Drop virtual getPixelSize() and add static FontScale.toPixels(..)

- Add fullString() for debugging purposed, including some font tables

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