Create clickable links when copying text into the log pane

[edreamleo]

See PR #2596.

Motivation: It is sometimes easier to run pylint and mypy entirely outside Leo. Rather than rerunning pylint or mypy inside Leo (to get clickable links) it would be more convenient to copy any errors from the console to Leo's log pane.

The paste code will match each pasted line against a list of regexes, creating a clickable link when a regex matches.

As a security precaution, the list of regexs will be limited to error messages emitted by known tools: python, pylint, pyflakes, black, and mypy. Later PR's could extend this list.