Music compatibility

[fishykins]

This is a small change that adds the option to stop music volume being set. If "ace_setMusicVolume" is false, music volume will not be set. Default value is true, so base functionality is unchanged.

[rebelvg]

Maybe you can add it as an ace setting so everyone can set whatever they want instead of what mission maker set.

[thojkooi]

This should make use of the ACE settings framework, rather than defining an own global variable.

Here is the documentation on it: https://ace3mod.com/wiki/framework/settings-framework.html

An example would be to add the following to the ACE_Settings.hpp file:

class GVAR(setMusicVolume) {
    value = 1;
    typeName = "BOOL";
    isClientSettable = 0;
};