Web Client: Sound Manager Issues

[AntumDeluge]

🐞 Describe the bug

• Sound Manager: Value being assigned is not a finite floating-point value #714
• gaps between music/looped sounds (this could be browser dependent)
• volume levels may not be set correctly from settings dialog (2df0596)
  • HTMLAudioElement uses floating point value between 0.0-1.0. Stendhal uses integer value between 0-100. The issue is likely due to values not being translated correctly.
• Performance is affected by a substantial number of sound events on large maps with many creatures. To mitigate the problem, entities that are too far away to be heard should be ignored. (87c1111)

🌍 Environment

• Web client