Important fix and several cosmetic improvements

Again, one fixed error from the previous version of the game, which was caused by trying to save as much memory as possible. This time it was more serious. After changing the control type, the game did not work. Sorry!

New colour animation when redefining keys and when entering a name in the high score table.

Text cursor animation when entering a name into the high score table.

Gradual darkening of the loading screen after loading the game and the control screen when starting the game with the ENTER key. On Spectrum 128K, the "GAME OVER" screen also gradually darkens.

New sound when starting the game with the ENTER key.