Supporting browser builtin implementation of AudioClip again

[jtulach]

• while working on Modern grid for the 10x10 minefield jtulach/minesweeper#3 & co.
• I realized HTML/Java Sound API can no longer play via browser's Audio object
• writing a test that initially fails
• providing a fix in b2c602d

[jtulach]

• in 2013 I had to distinguish among old JDK7 JavaFX WebView without Audio
• and newer WebViews (JDK8+) that had Audio object
• or real browsers that had Audio too
• at that time the typeof Audio was object
• these days it is function
  • inspite of calling Audio("some.mp3") yields and error suggesting to use new Audio(...) instead!
• I know the https://github.com/jtulach/minesweeper was playing its sounds in the past
• there must have been an incompatible change in the browsers since then
• that changed the typeof Audio
• interesting way to break someone's code

[jtulach]

Me: I do remember that in 2013 the typeof Audio was object. When did it change?

AI: ... there was a major architectural transition across all major browsers that changed web API constructors like Audio, Image, and Option from returning "object" to "function" under the typeof operator.

• Bug 829524 - DOM constructors should be typeof "function".
• Bug 83849 - Make DOM constructors have typeof 'function'

I haven't found those bugs/commits, but the explanation matches my memories.