Move params.monochrome_logs to local scope

[adamrtalbot]

Currently, functions like paramsSummaryLog uses params.monochrome_logs to decide whether to make the logs coloured. I think it's cleaner to move this to local scope and provide it as an input to the function. E.g., from:

// params.monochrom_logs = true
paramsSummaryLog()

to:

// params.monochrom_logs = true
paramsSummaryLog(monochrome = params.monochrome_logs)

This would allow pipeline developers to be more flexible about how to handle these things and not rely on a global object. For all we know, someone is out there studying monochrome logs with Nextflow and is frustrated by the confusing parameter.

[nvnieuwk]

I like this idea! Thanks for suggesting it