Rewrite player using the callback-based ScriptProcessorNode instead of multiple timestamp-scheduled AudioBufferSourceNode.
Let WebAudio API handle the sample rate and buffer size selection automatically.
Update libopenmpt to 0.2.4191 (compiled with emscripten 1.21).
Fixup index.html.
Merge pull request #1 from manxorist/master

Rewrite player using the callback-based ScriptProcessorNode