New Hamburg parser

[cvzi]

@jgraichen

The Hamburg parser from https://github.com/mswart/openmensa-parsers/ is broken.

Since the mswart/openmensa-parsers repository is not maintained and the website of Hamburg has changed significantly, I decided to write a new parser for Hamburg and host it on my own repository: https://github.com/cvzi/mensahd (https://cvzi.github.io/mensahd/hamburg.json)
I added it as a new parser to openmensa (https://openmensa.org/parsers/94).

The only problem is that the old parser is still active and the canteens are now listed twice.
Example:
Old https://openmensa.org/c/122 and new https://openmensa.org/c/1747

I was wondering if it is possible to either disable the old hamburg parser or get access to it on openmensa to change the feed urls?

If that is possible, I'd consider fixing some more of the broken parsers from mswart/openmensa-parsers

[jgraichen]

@cvzi I'll see if I can remove the older parser and reassign it the new source.

[jgraichen]

@mswart Can you think of good why on how to migrate the set of canteens to the new parser? Without breaking existing favorites, nor new ones?