v0.15.1

• (crypto, bridge) Added options to automatically ratchet/delete megolm sessions to minimize access to old messages.
• (pushrules) Added method to get entire push rule that matched (instead of only the list of actions).
• (pushrules) Deprecated NotifySpecified as there's no reason to read it.
• (crypto) Changed max_age column in crypto_megolm_inbound_session table to be milliseconds instead of nanoseconds.
• (util) Added method for iterating RingBuffer.
• (crypto/cryptohelper) Changed decryption errors to request session from all own devices in addition to the sender, instead of only asking the sender.
• (sqlstatestore) Fixed FindSharedRooms throwing an error when using from a non-bridge context.
• (client) Optimized AccountDataSyncStore to not resend save requests if the sync token didn't change.
• (types) Added Clone() method for PowerLevelEventContent.