v0.17.0

• Breaking change (bridge) Added raw event to portal membership handling functions.
• Breaking change (everything) Added context parameters to all functions (started by @recht in #144).
• Breaking change (client) Moved event source from sync event handler function parameters to the Mautrix.EventSource field inside the event struct.
• Breaking change (client) Moved EventSource to event.Source.
• (client) Removed deprecated OldEventIgnorer. The non-deprecated version (Client.DontProcessOldEvents) is still available.
• (crypto) Added experimental pure Go Olm implementation to replace libolm (thanks to @DerLukas15 in #106).
  • You can use the goolm build tag to the new implementation.
• (bridge) Added context parameter for bridge command events.
• (bridge) Added method to allow custom validation for the entire config.
• (client) Changed default syncer to not drop unknown events.
  • The syncer will still drop known events if parsing the content fails.
  • The behavior can be changed by changing the ParseErrorHandler function.
• (crypto) Fixed some places using math/rand instead of crypto/rand.