Alternative implementation for Tilde expansion

[prsabahrami]

As an alternative to #49. The tilde_prefix is being parsed at parser level which then results in an AST Node being created containing the user. (If the ~ should be expanded to $HOME, then the user is empty)
And then ~ is expanded later.

Note:~user is not supported yet.

[certik]

I think this looks good now. I'll let @wolfv to do the final review before merge.

The test does not run at the CI, correct? That is #82, that we should fix soon, but we can merge this PR first.

[prsabahrami]

I think this looks good now. I'll let @wolfv to do the final review before merge.

The test does not run at the CI, correct? That is #82, that we should fix soon, but we can merge this PR first.

Great!
Yes, testing needs improvement and the scripts are not running at CI.

[certik]

I tested this on Windows and Linux, it works with ls and cd and it seems to work very well. I am going to merge this, and we can improve upon this with subsequent PRs. One issue I already identified: #87.

[certik]

Thanks @prsabahrami for implementing this!

[prsabahrami]

My pleasure! @certik