new files: GdkFont.java and GdkGlyphVector.java, plus JNI backends

[graydon hoare]

Hi,

These files are companions to the recently posted GdkGraphics2D
implementation.  They provide very early, partial support for
accessing fonts and glyphs as exposed through GDK, pango, and
fontconfig. At this point they can only get about as far as finding
fonts, constructing them, converting character strings to glyph
vectors and measuring those glyph vectors; rendering is not yet
operational.

My assumption -- reasonably safe given current discussion on the cairo
list -- is that the glyph vectors produced by this interface will be
applicable to a cairo glyph drawing API soon to be decided on.

comments?

-graydon

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