fix: the bug with the negated/commented exclude patterns

[dokmic]

As from the Minimatch documentation, it should be possible to use ! at the beginning of the pattern to negate that. Same works for # which can deactivate the whole pattern.

The fix adds the following possibilities for the exclude patterns:

• Patterns starting with ! (e.g. !src/**/api.ts, !/home/user/src/**/api.ts) should exclude everything except the glob following after that.
• Patterns starting with # (e.g. #src/**/api.ts) should do nothing.
• Patterns starting with multiple ! will be negated multiple times accordingly.

Fixes #1024.

[Gerrit0]

Looks good, thanks!

[aciccarello]

Thanks for the contribution!