add a bunch of small utility functions to pick video modes based on things
like dot clock, resolution etc.

Add EDID framework. (No documentation as yet.)

This allows one to query monitors (or use BIOS EDID data) and learn their
default modes, etc. To use this, pass an EDID data block edid_parse(), and

Add EDID framework. (No documentation as yet.)

This allows one to query monitors (or use BIOS EDID data) and learn their
default modes, etc. To use this, pass an EDID data block edid_parse(), and
get back nicely parsed data, including precalculated modes using GTF, etc.

The result can be printed using edid_print().

Also, if you want to use GTF to generate modes without EDID, you can use the
vesagtf pseudo-device. vesagtf.c can also be compiled as a standalone program
to generate XFree86 modelines.

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Fix a few minor errors in the config data. Tested with a sample config.

Initial swag at common video mode database. Not used for anything (yet).