[10616] Simplified trade distance checks, GROUP_UPDATE_FLAG_POSITION flag handling moved out of Map

[newsbot]

<pre>m src/game/GridNotifiers.h
m src/game/GridNotifiersImpl.h
m src/game/Map.cpp
m src/game/Player.cpp
m src/game/Traveller.h
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10616] Simplified trade distance checks, GROUP_UPDATE_FLAG_POSITION flag handling moved out of Map

note: need avoid Map::PlayerRelocation calls now and use Player::SetPosition instead</pre>




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