Added audioproperties, removed unused para, added new "keep" var

[Chillu1]

Added a new keep variable, which will keep the audio info in dictionary on scene change, so we can use it later again. Without duplicate preparation.

Imo the current PrepareSound, PrepareAudio, etc way is not ideal. Adds extra code duplication, so I added a AudioProperties instead. Example of use:

_winningSoundId = EazySoundManager.PrepareAudio(new AudioProperties()
    { audioType = Audio.AudioType.Sound, clip = Resources.Load<AudioClip>("Audio/SoundEffects/WinningSound"), keep = true});

or:

_defaultDanceMusicId = EazySoundManager.PrepareAudio(new AudioProperties()
{
    audioType = Audio.AudioType.Music, clip = Resources.Load<AudioClip>("Audio/Music/dance"),
    volume = 0.2f, loop = true, persist = false, keep = true,
});

Also removed "currentMusicfadeOutSeconds" since it was redundant

[Chillu1]

Forgot to mention. This only happens when I spam the sound a fair amount. Let's say the player jumps 10-20 times a second in a small area, hitting his head a lot.

[bendangelo]

Thanks for the fix. This should be merged in.