mod_poke_strangers: Fix incorrect log method calls

mod_http_muc_log: Remove compat for very old MUC API room:get_public() first appeared in 0.10.0

mod_http_admin_api: metrics: Filter out a value that is commonly nan at startup The upload bytes count is typically nan at startup, which cannot legally be encoded in JSON. I haven't assessed whether any other metrics might emit nan under other circumstances, but this fixes the most visible issue right now.

mod_groups_muc_bookmarks: Don't add deleted MUCs to user bookmarks

mod_groups_internal: Add flag to indicate when a linked MUC has been deleted In theory this shouldn't happen, but it could (and apparently does).

mod_groups_internal: Also remove MUCs that still exist, but have been destroyed Tombstones could previously fool us into thinking the MUC was still there.

mod_groups_muc_bookmarks: Sync bookmarks when user is added/removed to/from multi-MUC group This was overlooked when multi-MUC support was first implemented.

mod_groups_internal: Sync MUC affiliations for multi-MUC groups This was overlooked when multi-MUC support was added.

mod_groups_internal: Save MUC room after creation to commit it to storage Without this, the MUC could be lost on an unclean shutdown.

mod_groups_internal: Fix traceback when room doesn't exist I'm not sure if it should even be included if it doesn't exist, but I'm not currently sure how this situation occurs, so I'm implementing the lightest possible fix for now.