Only one API key required now

I've removed the Gelbooru API requirement by bundling a local copy of the relevant Gelbooru metadata in the game file. This means you only need one credential to play now! 

Aside from lowering the barrier to entry, it also means the search results are better, since I can implement a proper partial search locally on the entire universe of relevant images instead of dealing with the API's very limited query options, and it makes the game much faster as before I was using a process that generated 2-3 API calls (each >1 second latency) per turn to iteratively narrow the search due to the aforementioned limitations of the API.

I've also fixed a bug that changed the effect thresholds for some app effects when they got "Calibrated"