Support buttons > 5 in translation tables [v2]

Add support for arbitrary button numbers by replacing the table-driven
detail parsing for BtnDown/ButtonPress and BtnUp/ButtonRelease with a
custom parser that allows for an arbitrary button number (1-255) after
the 'Button' prefix.

Document what this syntax looks like in the table of detail information.

Signed-off-by: Keith Packard <keithp@keithp.com>
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