Switch to upstream nf-core modules where possible

[lbeltrame]

This issue is to track the potential replacement of homegrown modules with others that are being developed in nf-core, and it is one prerequisite to start upstreaming. This only involves already existing modules in nf-core, not creation of new ones.

Solid biopsy

• No modules upstream

Liquid biopsy

• ichorCNA (PR Update ichorCNA to the nf-core upstream versions #57 )
• WisecondorX (PR Use upstream nf-core module for WisecondorX #51)