Drop --type setting

[benoit74]

We recently merged --type channel and --type user. I think we should go even further and simply remove the --type setting.

It means we currently have either --type channel or --type playlist. This --type parameter is however mostly useless because the ID we are passing are unique, we cannot confuse a playlist with a channel or a user or a handle.

It looks like it is often complex for the user to properly set this setting.

I think we could hence simply drop this --type setting and try to guess which type of --id has been passed, we could always consider the ID passed with --id can be a channel, a user, a handle or a playlist, and test the 4 possibilities in a row.

This would help save lots of headaches to our users and it takes very little time to test the 4 possibilities in a row.

For backward compatibility reasons, the --type parameter should be kept until next major, but should simply be ignored,

I didn't check how easy this is to implement (we have maybe special flow when --type playlist is used).