UI: Re-introduction of the option to select sound quality

[kai-li-wop]

In WoP 1.5, the option to select the sound quality was no longer functional, probably because SDL was introduced and the necessary adjustments were not made at this point. Then with WoP 1.6 the menu item was removed completely, because it didn't work, instead of adapting it.

ioQuake3 has already made these adjustments and we should adopt them directly like this. I find here the menu item "Sound System" with the selection options "SDL" and "OpenAL" clearer than the option "Use OpenAL" with the selection options "on" and "off".

The new menu item "SDL Sound Quality" should then offer "Low", "Medium" and "High", where this corresponds to 11kHz, 22kHz and 44kHz. If OpenAL is selected as the sound system, this menu item should also be grayed out, as in ioQuake3, since it only applies to SDL. Also it needs the accept button to show after changes. I have drawn a little something:

[kai-li-wop]

BTW: "Auto switch Song" should be changed to "Auto Switch Song :" to unify with the rest of the menu options.

[kai-li-wop]

• When I start the sound menu, the "Apply" button appears directly without me changing anything. When I click it, it disappears without any action except the click sound. So this is not working correctly.
• Provided I make a change, "Apply" is still displayed and the changed option is applied accordingly with a restart. So that works fine.
• Selecting the sound system and selecting the SDL quality also works fine. Changes are applied.
• The option "Auto Switch Song", the colon ":" is still missing in the last position, should be "Auto Switch Song:".
• In general: sample rate does not have to be 32bit, 16bit is enough. WoP has no sound files that would need 32bit. Of course this has nothing to do with the sound menu.

[kai-li-wop]

Fixed the menu order and auto switch song option string with 97427e9199e31a84417308dbce70744e857f8ebd. Everything works now like expected.