Resource files are no longer packaged and preloaded all in advance.
Instead, they are downloaded while the game is running.
The implementation is less than ideal, but it works. Resources are
requested on demand and cached into IDBFS. Unfortunately, since the
resource system was not designed with web-style asynchrony in mind and
we aren't ready for threads either, we have no way to do any useful work
while a required file is downloading. To somewhat offset that, we also
pre-fetch files that were not requested yet. The pre-fetching is limited
to 4 files at a time, which seems to be a reasonable compromise between
throughput and cold-cache load latency on slow connections. Also
unfortunately, it's dumb as rocks: we have no way of knowing which files
we will actually be needing soon, so the pre-fetching is done in
whatever order the files were indexed.
Possibly the easiest way to improve this system would be to bundle (and
compress) all of the tiny text files together to alleviate the overhead
of hundreds of HTTP requests.
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