Map Creator: Added support for "anchor" system

object can be set as "anchor" so it can be used for areas as a (0,0) coordinate for map integration of the area,

no adjustements to engine needed, because engine takes the first element in area as (0,0),

"anchor" is set as the first element by map creator,

so there is no problem with edited areas, which can be out of position at creation/map intergration, if object is remmoved / replaced,

which yould cause to area shifts/glitches of area position, because of mixed up object position in list of area objects

so use "anchor" object to make shure area is set correct