slither-mutate: bugfix when two files have the same name

[DarkaMaul]

This PR provides several bugfixes on top of #2302:

• If to files were backuped / mutated with the same name (e.g. path/Token.sol and path2/Token.sol).
• If the mutation directory was not set to mutation_campaign, the mutants were not written in the appropriate directory
• If the contracts-name parameter was used, contracts were not properly filtered
• Contracts could be mutated more than once

On the quality side, it also try to replace most of the os module usage with Pathlib for additional clarity.

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[CLAassistant]

All committers have signed the CLA.

[0xalpharush]

@DarkaMau Thanks for your interesting in contributing. l Would you sign the CLI please?

[bohendo]

This is great, this fixes an issue I hadn't encountered organically yet but is important. Plus, the other bits of code clean up are things I'd been thinking to do anyway.
Love it. CLA signature aside, this is ready to merge this into the fit-and-finish branch IMO