util.h: lookup() uses forwarding refs; added Dispatch/dispatch and REGISTER_ENUM

The Dispatch<> template and dispatch(), a facility function for it, simplify dispatching to functions that have different signatures that still can be converted to the same std::function<> type. The case in point is in event.cpp; Event::fromJson calls make() that always returns the type we need; however, once we have several possible base types (Event, RoomEvent, StateEvent), we'd have to either write a specific make() incarnation for each of them, or mess with function return type conversions. Dispatch<> helps to keep the code clean.

REGISTER_ENUM is a cross-Qt versions approach to dumping enumeration values to qDebug() and the likes.

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