New JSON structure

[Timendus]

TODO

• Finish platforms.json
  • Add missing platforms
  • Write missing descriptions
• Update README

Comparison to the other PR

Merging in the Space Invader meta data from #3, we now get this far:

• Stored:
  • Title
  • Description (but closer to the "canonical" description)
  • Year of release
  • Author
  • Platform(s) as a complex entity
  • List of binaries instead of the one-on-one mapping
  • Keys
• Not used:
  • Author objects (may revisit that in a future PR)
  • Images (that's definitely coming in a future PR)
  • Category -- don't really see the use yet if we have no way of filling that property
  • Version -- most ROMs have just one version, so left it out
  • All file names -- just the one for now; in fact, I'm considering removing file names all together because they are super unreliable for matching and thus add very little functionality
  • Source code meta data -- seems only useful if we also share source, but then why not just add the binaries to this repo too... 😄
  • Interpreter -- Could be fun to know, but again this is probably going to be a property that's almost always empty