Use arraybuffer-loader in place of buffer-loader

[mzgoddard]

Resolves

Pull out the arraybuffer-loader part of #1104.

Proposed Changes

Replace buffer-loader with arraybuffer-loader.

Reason for Changes

buffer-loader inlines binary files in webpack builds by encoding them as numeric literals. Each byte encoded this way uses 2 to 4 bytes. arraybuffer-loader encodes the data as base64 and decodes it back into numbers at runtime using 1.33 bytes for each encoded bytes. arraybuffer-loader saves on bandwidth to download the resulting js and the amount of space in memory the script takes.

Quoted from #1104

Test Coverage

Builds and runs the existing music extension tests.

[rschamp]

Thank you!