Android Audio Fix

Add -D flambe_html_audio_fix to haxe_flags to change how flambe handles
HTML audio.

Only 1 looping sound will be allowed to play.  This assumes that the
one sound you want to play is looping background music.
- Any sounds that don't loop won't play.
- Any sounds that loop that are called after a song is already playing
won't play.
- If WebAudio is supported, audio plays normally