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Old Icecast versions (lower than 2.4.0), all current icecast-kh versions
and derivates of that like the AzuraCast kh-ac fork do not treat the
HTTP headers in the response as case-insensitive even though this is
required by the HTTP RFC.
Go by default canonicalizes the Headers, to prevent that and actually
write our case-sensitive keys we need to access the map directly.
This adds a helper that does so, tests for the helper and uses the
helper in the relevant places in yp.go.

Fix #11

Fixes #5

Fixes #8

The following order is used: ',', '/', ' '

See #9

See #8

Codecs and Genres overview pages now ordered by count of Streams for that Codec/Genre
Codec and Genre detail pages ordered now by listen count
Also changed behaviour for Genres with / or special characters