v2.7.0

• Hashlists are now read from a file exclusively
• Pull in Luffy's hashlist using a submodule rather than having our own in the repo
• Detailed version information now appears in the titlebar
• Lights now imported and exported as GLTF punctual lights (this is probably of little use as yet, but it's there).
• GLTF importer and exporter now respect the standard 1m scale. Existing models will appear the wrong size.
• GLTF exporter now handles rigging rather than ignoring it.