Support bitmap fonts

To allow FontConfig to work with Bitmap font, we shall pass the size
we are interested in, and account for the size returned in the font
matching process. This is, because we cannot scale those fonts.

FontConfig will return the closest match, and we take its returned
pixel size back when we are rendering the glyphs.

There's an oddity when call set_char_size in TrueType - we need to
behave as if the DPI is 72. It is due to the following macro:

    #define FT_REQUEST_HEIGHT( req )                                        \
          ( (req)->vertResolution                                           \
              ? ( (req)->height * (FT_Pos)(req)->vertResolution + 36 ) / 72 \
              : (req)->height )

Further work can allow for integer scaling of the largest bitmap
font variant.

Tested with Terminus PCF-type font under Linux.

This addresses issue #582 .

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