Resolved fleets selection on changed active player

Added the playerEnv for the fleet planet listing when the current player
is changed, this was broken due to missing change of the playerEnv/env
of the player and fixing a while loop not counting done..

Changed the forgotten "h" key function, which positions the galaxy back
to the home coordinates of a player - this feature might change in the
future, for example to define "hot spots"/bookmarks on the current
screen location..

This also introduces the startX and startY which should define the
"home" star galaxy location of the player, this value is defined by the
home planet on generation, but might change later on as described.