This will enable porting things to binding/expression lookup.
I probably didn't _really_ need to make everything properties, but that was easier to do than figure out which ones would really be needed.
Ran discovery on `pidgin.im`; saw `conference.pidgin.im` show up, then expanded it and the various rooms appeared, as they should. Clicked Add on a few and verified that the Add Chat dialog appeared with the correct values.
Reviewed at https://reviews.imfreedom.org/r/2210/
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