Add new template variables for multi-disc sets

[eharris]

It would be nice if there were different disc_template and track_template config for multi-disc sets (where the Total Discs is not equal to 1). Perhaps disc_template_multi and track_template_multi, that by default take the same config as the non-multi templates if they aren't specifically set.

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[marioqxx]

I had the same question, but found a solution for me with the use of:

• %M: total number of discs in the chosen release
• %N: number of current disc in *_template-definition. I use: %%N-%%t %n for the trackname. I.e. the first digit is the CD-number, followed by the track-number (separated with a "-") and finally followed by the track name.

[eharris]

Yeah, I found %M and %N, but this is asking to have a set of templates that applies only for multi disc sets, so that I don't have to have a prepended disc number when there is only 1 disc.