Merge branch 'new-event-store' into master

include/mtx/common.hpp

include/mtx/events.hpp

include/mtx/events/collections.hpp

include/mtx/events/common.hpp

include/mtx/events/encrypted.hpp

include/mtx/events/reaction.hpp

include/mtx/responses/crypto.hpp

include/mtx/responses/turn_server.hpp

include/mtx/secret_storage.hpp

include/mtxclient/crypto/client.hpp

lib/crypto/client.cpp

lib/http/client.cpp

lib/structs/common.cpp

lib/structs/events.cpp

lib/structs/events/collections.cpp

lib/structs/events/common.cpp

lib/structs/events/encrypted.cpp

lib/structs/events/reaction.cpp

lib/structs/responses/common.cpp

lib/structs/responses/crypto.cpp