Support binary integer literals and digit separators

Example: 0b10000000'00000000'00000000'00000000

I rewrote the pattern to match integer literals so it’s stricter though will still match a partially typed number like ‘0x’ or one with a trailing digit separator (also considered partially typed), although here it marks the trailing separator as invalid.
Single quotes are not paired for integer literals

This way one can add the single quotes while typing without TextMate auto-inserting the end quote.

With a selection, single quotes are still paired (even when the selection is a string literal), assuming that people want wrapping rather than overwriting.