codec: separate mimetype for encoding and decoding

[dolmen]

This is necessary to remove hack for HTML encoding which is is not symmetrical.

[dolanor]

Do you mean because HTML codec has only encoding and HTML Forms codec only has decoding?

[dolmen]

Yes. AcceptEncoder has hardcoded references to that specific codec.

rip/encoding/encoding.go

Line 90 in 379a63b

if acceptHeader == "text/html" && edit {

[dolanor]

Yeah, there is some experimentation of content negociation still all over the place once I played with HTML page and forms. It bled a little more than what I wanted.
One day when I'm fresh and a clear mind, I'll refactor all of this, because it is messy.