Reorder map loading

MascaraSnakerequested to merge
move-map-copying into next

Two changes to the order of map loading that will become necessary with UDMF:

  • Move P_ProcessLinedefsAfterSidedefs into P_LoadMapData, where it really belongs
  • Move the copying of map data for netplay synchronization closer to the end of P_LoadMapFromFile, after all the functions that mess with the map data have been called.

srb2win-mapdatacopy.exe

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