[BUG/HTML5] Audio needs to be played first before making a waveform

[ACrazyTown]

This is a limitation of the method I use for waveforms on HTML5. As far as I know, howler.js (audio backend lime uses on HTML5) only exposes the audio buffer when the sound is playing. Trying to make a waveform while the sound isn't playing will result in nothing because the waveform can't get the audio buffer.

[ACrazyTown]

Also, trying to create a waveform instantly (even if there's a safeguard waiting for an user interaction) will likely cause a crash. I assume it's because the audio context doesn't get created fast enough