AFP: add updated artwork, fix the bug where opening the plugin w/o samplebuffer glitches the wavegraph
Samplebuffer: use qualitysettings for interpolation (currently defaults to SINC_FASTEST on playback), also: in visualize, draw both channels instead of averaging them into one graph (otherwise, samplebuffers with counter-phase content show up as flatline)
Merge pull request #589 from diizy/master

AFP: add updated artwork, fix the bug where opening the plugin w/o sampl...