Xcp, an extended cp implementation with progress-bar and .gitignore support (alpha)

This the first release of xcp, a cp-like utility with some extra features (currently progress-bar and .gitignore support), in the spirit of other tools such as tin-summer and bat.


This version should be considered alpha; it has a test suite to validate basic sanity, but it may have some unexpected behaviour compared to cp's implicit defaults. Testing and feedback welcome.