- more cleanup on portal implementation:

- store portal data in a separate structure.
- store portal data in savegames because some of this will be changeable later.
- run a cleanup pass after all portals have been created to weed out broken ones.
- add a definition type that's compatible with Eternity Engine's line portal types.
- swapped arg[2] and arg[3] of Line_SetPortal, because the type is more significant than the alignment.

src/r_bsp.cpp

@@ -99,7 +99,7 @@ static BYTE		FakeSide;
 
 int WindowLeft, WindowRight;
 WORD MirrorFlags;
-TArray<PortalDrawseg> WallPortals;
+TArray<PortalDrawseg> WallPortals(1000);	// note: this array needs to go away as reallocation can cause crashes.
 
 
 static subsector_t *InSubsector;