Keep more saved games in case ADOM crashes during saved game handling
We now use the ".emg" file ending for saved games written during emergency saves. Also we use ".au1" to ".au5" for automatic saves during a game.
This allows us to have more backup saved games in case that something goes wrong with the original saved game. We keep ".bak" for the saved game that is created once a saved game is loaded.
Right now there is no nice recovery dialog in ADOM, so in case a saved game gets corrupted, you have to check the files manually.
Please note that to the automatic saved games are rotated, so ".au5" is not always the lastest saved game (you have to check the dates of the files)!