Prevent map loading from restarting unnecessarily when clicking on the map selection multiple times

**Describe the bug** When repeatedly clicking on the map selection or multiple times to load a map, the load process becomes interrupted, resulting in a longer wait time before the map is loaded. It would be better if the load process didn't start from scratch each time you click (e.g., the clicking should be blocked during loading). **To Reproduce** Steps to reproduce the behavior: 1. Open the game and navigate to the map selection. 2. Select a big map multiple times. 3. Observe that the load process restarts from scratch each time, resulting in a longer wait time. **Expected behavior** When clicking on the map selection or reloading a map, the load process should continue from where it left off, rather than restarting from scratch. This would improve the overall loading experience and reduce wait times for users. **Desktop (please complete the following information):** - Game version v0.7.4