Image importing / linking

[heavyimage]

For this application to work at all, we need to be able to:

• Load any number of files from outside the app into our project.
• Ensure this also works if done after work has been done eg adding more images to a project later
• Store paths to images in .goop file so they can be loaded at project open time without needing to embed the images in our project file.
• Try to create best-guess metadata per image based on the filename / Aaron's supplied regex but offer a chance to override.

Big concern

Can we load 16 bit tiffs into an electron app? Chromium doesn't support tiffs natively I think so we could try this bit of javascript but I dunno if it supports 16 bit tiffs.