CSVify everything

[hoshsadiq]

This PR changes everything to rely on CSVs rather than YAML. Instead of specifying code, it simply does a look up on the channel name, and assigns the relevant columns as the real values if set.

A number of things have been removed:

• core.output: this is now always m3u. If CSV is needed, you can output it using the -csv flag.
• core.canonicalise: Rely on CSV instead (see README)
• providers.ignore_parse_errors: this is the default now. errors get ignored.
• providers.filters: Rely on CSV instead (see README)
• providers.setters: Rely on CSV instead (see README)

This might as well be practically a rewrite.

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