Use highlight-numbers-number instead of writing my own number parser

This is cleaner, more maintainable, and it has a couple of added benefits:

1. It will no longer be troublesome for people switching between themes, since
   the hook that we automatically injected would still be there.
2. Lexical binding is not discarded, with all its benefits.

As suggested by @riscy in https://github.com/melpa/melpa/pull/6808.

Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>

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