StateEvent; EventContent::SimpleContent; event types refactoring

* StateEvent<> is a new class template for all state events. It provides a uniform interface to the state content, as well as a means to serialize the content back to JSON. In addition, StateEvent now parses the "prev_content" JSON object, so one can refer to the previous state now (a notable step to proper reflection of state changes in the displayed timeline in clients).
* EventContent::SimpleContent, together with StateEvent<>, forms a generalisation for simple state events, such as room name, topic, aliases etc. that boil down to a single key-value pair. DECLARE_SIMPLE_STATE_EVENT is a macro defined to streamline creation of events based on SimpleContent, providing API back-compatibility for events defined so far. As a result, a very concise simplestateevents.h replaces all those room*event.* files.
* Event/RoomEvent::fromJson() code is squeezed down to plain type lists passed to makeIfMatches() "chained factory" function template. TypeId is mandatory for an event type to be included into that factory.
* Event::toTimestamp() and Event::toStringList are completely superseded by respective fromJson<>() converters.

1 files changed, 1 insertions, 4 deletions

diff --git a/room.cpp b/room.cpp
index 1b6afac9..c4e4c6cd 100644
--- a/room.cpp
+++ b/room.cpp
@@ -23,10 +23,7 @@
 #include "jobs/generated/banning.h"
 #include "jobs/generated/leaving.h"
 #include "jobs/setroomstatejob.h"
-#include "events/roomnameevent.h"
-#include "events/roomaliasesevent.h"
-#include "events/roomcanonicalaliasevent.h"
-#include "events/roomtopicevent.h"
+#include "events/simplestateevents.h"
 #include "events/roomavatarevent.h"
 #include "events/roommemberevent.h"
 #include "events/typingevent.h"