Suggestion for short versions of command line switches

[yerlaser]

To make the CLI more conformant to the convention I would suggest to add the following short versions of CLI switches:

• -F = --no-regex, in other words, fixed strings
• -I = --ignored

Examples, ripgrep, fd etc.
I can make a pull request if you agree to the changes.

[nyurik]

I would also add -u handling similar to ripgrep's. From the docs:

As a special convenience, ripgrep also provides a flag called --unrestricted (-u for short). Repeated uses of this flag will cause ripgrep to disable more and more of its filtering. That is, -u will disable .gitignore handling, -uu will search hidden files and directories and -uuu will search binary files. This is useful when you're using ripgrep and you aren't sure whether its filtering is hiding results from you. Tacking on a couple -u flags is a quick way to find out.