FlxSound and FlxG.sound: Large refactor of sound initialization

[Geokureli]

FlxSound

Add new chained setup system, I.E.:

mySound.load(path).setup(volume, numLoops, autoDestroy, onComplete).play()

Changes

• Add setup method, to init playback fields like volume, looped, loopUntil, autoDestroy and onComplete
• Change some new methods from FlxSound: Rework load method names #3479 and Add support for music streaming #3518
  • Removes "setup" fields from load, loadStreamed and loadFromURL
• Small improvement to event handling
• Small improvement to amplitudes (a flash only feature)
• Add internal updateProximity, update positional sounds when they move, rather than the next update
• Give SoundFrontEnd full private access to FlxSound
• Add Null types in various places
• Various doc fixes
• Add unit tests (disabled on ubuntu - Overhaul to CI #3562)

FlxG.sound

Similar chained setup to work with FlxSound changes:

FlxG.sound.create(path).setup(volume, numLoops, autoDestroy, onComplete).play()

Changes:

• New overload of playMusic, deprecating the old function
• Deprecates load and loadStreamed for the new create and createStreamed
• Replaces loadFromURL with createFromURL
• Add Null types where needed
• Add Unit tests

FlxG.assets

• Make canStreamSound dynamic
• Make addSoundExt public

FlxAssets

• Add assertBitmapData, assertSound and resolveSound
• Add logging to resolveBitmapData