Cannot Stop sounds created on client with SoundUtils

[AverageLuaScripter]

You cannot stop sounds created on the client with SoundUtils. This is as it uses DataModel:GetService("SoundService"):PlayLocalSound to play sounds locally. If the end user were to destroy the sound while it was still playing, it'd still play and this is especially annoying for use-cases such as doors or tools.

Another pet-peeve is that task.delay continues to run even if the sound is destroyed. Check if the sound is destroyed so you're not calling a nil value!

[Quenty]

See #256 for details on a fix for this!