Renamed Character -> CharacterData in the accountserver
Converted the Character class into a component

A CharacterData was created as a proxy class in order to allow using the
old serialization method.
Converted Being into a Component

I did not really care too much about staying consistent with the use of
static_casts to Actors since they are only temporary anyway until Actor
is a component too.
Moved Actor into an Component

This was the final step to remove the hierachy with Entity on the top.