Event::content() -> contentPart()

There's a clash between Event::content() (a template function) and
RoomMessageEvent::content() (plain member). Out of these two, the name
more fits to the RME's member function - strictly speaking,
Event::content() retrieves a part of content, and so is renamed.
In addition, contentPart() defaults to QJsonValue now, which is pretty
intuitive (the function returns values from a JSON object) and allows
to implement more elaborate logic such as

if (const auto v = contentPart<>("key"_ls); v.isObject()) {
  // foo
} else if (v.isString()) {
  // bar
} else {
  // boo
}

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