Separate "name" and "class_name" (so we can export the same graphic twice for testing) and also fixes to multi-graphic exporting (.graphic pointing to .asset file)

Pulled in a bunch of skeletal stuff, it probably doesn't work (and it for sure doesn't save the export), but it compiles

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)

Exporter.fla now grabs sprite-style frames and packs them to sheets (no return data yet)

Debug mode for DebugExporter.fla (run the fla first, then connect to it as many times as you want with exporter.py) and random exporter fixes

Proper interaction with the exporter now using the new format