playerInfos
...
Multiple PlayerInfos in Server!

Work in progress -- does not work yet --
Check Serializability of ResearchState - ResearchTree
Multiple PlayerInfos
PlayerInfo.ResearchData disconnected from ResearchData

TODO: ClientSide has to react to PlayerInfo
PlayerInfo.ResearchData disconnected from ResearchState
Bulldozers are weird
bulldozing and panelRefreshing fixed

bulldozing still needs preview change
MapScanner reacts to playerID
TimeSynchronization between server and client
merged w/ #14
Merge branch 'new_master' of https://github.com/Metha-Gruppe/methapolis-java into new_master