FramePacker sort only *remaining* frames to pack, because when we skip the index forward by the number of frames we packed, we won't necessarily be skipping the correct frames (since we skip in the *UN*sorted array). Instead, sort this.frames at the start of FramePacker process

Exporter now packs all graphics on the same FramePacker, and sends all the pngs back (had to up the string length size to 4 bytes for all the data)

Proper interaction with the exporter now using the new format

Working sending base64 over the json channel to load a MovieClip source in the Exporter.fla

Sending messages properly back and forth using the new driver architecture, and a proper message queue+program completion