Sets the size of the playing field centered around <tPosition> to the size specified using <tDimensions>.
Note: while it is possible for ships to exist outside the playing area, it is not possible to move a ship outside this area.
The dimensions set by this function also affect the size of compass world plane in the sensors manager.

<tPosition>: a table containing the center coordinates of the playing space.
<tDimensions>: a table, or vector, containing the dimensions of the map along each axis.