Merge branch 'statediffs' into 'master'

Cargo.lock

Cargo.toml

src/client_server/account.rs

src/client_server/context.rs

src/client_server/membership.rs

src/client_server/message.rs

src/client_server/room.rs

src/client_server/session.rs

src/client_server/sync.rs

src/database.rs

src/database/abstraction.rs

src/database/abstraction/sqlite.rs

src/database/rooms.rs

src/database/uiaa.rs

src/main.rs

src/pdu.rs

src/server_server.rs