Sanity pass of saved game format

This adds several fields to the saved game format that were simply missing.
- Monster boolean flags (for summons)
- Some missing monster ability details (for summons)
- Special on talk (for creatures)
- Max SP and morale (for creatures)
- Source scenario (for encounter notes)

It also changes the default resist to 0 instead of 100, meaning that
resistances will be saved almost always, but should be loaded correctly.

The target location is no longer saved for creatures.
There was already code that nulled it out after loading,
so now that just happens during loading instead.

The town active flags (belt_present and quickfire_present)
are now set during loading instead of after loading.

This changes the save format, so there will be minor incompatibilities.
In particular, monster health won't be loaded correctly from older saves.

src/game/boe.fileio.cpp

@@ -95,25 +95,7 @@ void finish_load_party(){
 	build_outdoors();
 	erase_out_specials();
 	
-	if(!town_restore) {
-		center = univ.party.out_loc;
-	}
-	else {
-		for(int i = 0; i < univ.town.monst.size(); i++){
-			univ.town.monst[i].targ_loc.x = 0;
-			univ.town.monst[i].targ_loc.y = 0;
-		}
-		
-		// Set up field booleans
-		for(int j = 0; j < univ.town->max_dim; j++)
-			for(int k = 0; k < univ.town->max_dim; k++) {
-				if(univ.town.is_quickfire(j,k))
-					univ.town.quickfire_present = true;
-				if(univ.scenario.ter_types[univ.town->terrain(j,k)].special == eTerSpec::CONVEYOR)
-					univ.town.belt_present = true;
-			}
-		center = univ.party.town_loc;
-	}
+	center = town_restore ? univ.party.town_loc :  univ.party.out_loc;
 	
 	redraw_screen(REFRESH_ALL);
 	univ.cur_pc = first_active_pc();