Toggle, resize and re-order columns

[martpie]

I splited these tasks from #62 to add more granularity, otherwise it will never be done.

• columns arrangement in config.json
• toggle columns with a context/menu
• resize columns with click-and-drag
• reorder columns with drag

default:
- title
- duration
- artist
- album
- genre

optional:
- play count
- album artists
- year
- track
    - no
    - of
- disk
    - no
    - of
- createdAt
- rating

[ldexterldesign]

#62 (comment)

FYI I would take track # and/or year over genre any day of the week

Best regards

[blackshibe]

I added the ability to toggle columns in a fork with persistence. I'm not sure how to tackle resizing, considering I haven't done dynamic css in react before but I can try.

[martpie]

Mind opening a PR so I can have a look and see if we should backport it?

I'm doing a big rewrite right now, but we can still have a look.

[blackshibe]

I'll do it.