[BREAKING] Change the behaviour of the unverfied devices blacklist flag
Previously the global flag was used as a way to completely ignore the per-room option. This commit makes the per-room and global settings be more flexible to allow users to, for example, blacklist unverified devices in all room with the exception of one or two. This is done by making the global setting a device-level default and the per-room option allowing for 3 states: true, false, and unset (use device default).
Signed-off-by: Travis Ralston <travpc@gmail.com>