Transfer properties of COAL breaking into BCOL (Fixes #602)

Fixing a problem where decoration is not transferred from COAL to BCOL when broken. All properties of COAL should now be copied to the new BCOL particle, including if it is burning, decoration and discoloration caused from heating.

src/simulation/elements/COAL.cpp

@@ -63,7 +63,7 @@ int Element_COAL::update(UPDATE_FUNC_ARGS)
 		else if (parts[i].tmp<40&&parts[i].tmp>0)
 			parts[i].tmp--;
 		else if (parts[i].tmp<=0) {
-			sim->create_part(i, x, y, PT_BCOL);
+			sim->part_change_type(i, x, y, PT_BCOL);
 			return 1;
 		}
 	}