Metadata saving

When saving, a new file with the suffix .omnivore will be saved along with the binary file. It currently contains the segments you've created and any comments you've added, and will eventually contain more info about modifications you've made to the file. It's purpose is to save the documentation as you go through reverse engineering the file.

Also added in this release is a disassembler framework with a bunch of processors (most won't be interesting to you) and a bunch of graphics modes (most won't be interesting to you either).