Refactored running loop().

- shouldExitLoop() is a bool again and introduced new flag isReloaded() instead
  of adding special hacky value 2
- loop() accepts 2 parameters: loop substatus and shouldExit flag, because each
  caller previously had to set and restore these manually.  loop() now also
  tests whether the substatuses are properly nested.  reordered the
  loop-exitting code.
- renamed loop substatuses to logical names
- enterNewRoom() returns bool whether loop() should continue so that start()
  doesn't have to test and clear shouldEndProgram().  it doesn't need
  force_reload as a parameter anymore.
- dialog selections use new inner substatus instead of outer substatus, for
  consistency

svn-id: r45607

engines/draci/saveload.cpp

@@ -152,7 +152,7 @@ Common::Error loadSavegameData(int saveGameIdx, DraciEngine *vm) {
 	// Post-processing
 	vm->_game->scheduleEnteringRoomUsingGate(vm->_game->getRoomNum(), 0);
 	vm->_game->setRoomNum(vm->_game->getPreviousRoomNum());
-	vm->_game->setExitLoop(2);	// 2 > true means immediate exit for the loop
+	vm->_game->setIsReloaded(true);
 
 	vm->_game->inventoryReload();