Fix pantheon.cli.PantheonCommandTest test on Windows

[Nashatyrev]

1. change replaceAll to replace since the first one treats backslashes in replacement string as special chars. (surprisingly replace also replaces all occurrences :)
2. Since we are injecting a path as a TOML sting literal, we need to escape all TOML special symbols. I didn't find suitable function in the TOML lib, but escaping looks almost compatible with Java strings, so I used Java escaping. For this I added Apache commons-text test dependency. If anybody knows suitable existing lib I would happily replace this new dependency

Resolve #379