Add Analogue Pocket pack.

[hotelvictorcharlie]

I'm leaving this as a draft PR for now, because we need #846, #854, and #862 to be merged first (in order to get the standalone packs that we need to reference). ~We also need #855 to be merged in order to make a few of the hacks/translations/homebrews compatible with the Pocket's SNES core.~ The last sentence is no longer relevant as the SNES core has support for SMC headers now (although that PR is still a good idea and should be merged).

The Neo Geo core requires a .bak file and all of the cores require .json files, so I removed those extensions from the banned suffixes list.

Side note: The Darksoft Neo Geo pack's files are all located inside a games/ subdirectory. I'm not sure why that's there, but it shouldn't exist on the Pocket. So you're supposed to copy Darksoft Neo Geo/games/* into Analogue Pocket/Assets/ng/common/. I'm not sure how to specify/explain that in the placeholder, unless we can just update the Darksoft Neo Geo pack to do away with the games/ subdirectory entirely.

I strongly suggest doing a "Squash and Merge" on this PR due to the large number of commits.