Beta 0.43 released

[h1]UE Beta 0.43 (2024-10-17)[/h1] [list] [*] Added the level Asteroids level Agoraphobia (actually added it in 0.42, but forgot to tell about it) [*] Fixed the menu not remembering the selected level if the name contains blank characters [*] Added a modal difficulty selector at startup of the game [*] Experimented with reactive armor for the caves, also known as school gym mats. Will come soon. [*] Reduced the number of entries displayed per page in the leaderboards [*] Researched for the root cause of an error in the settings dialogue. Still in progress... [/list]