Run some promises in parallel, wait for all promises #32
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Waiting for getAllTerrainData(), getUserData() and runtimeData.get all at once is giving me a decent speedup. Before it was about 600-900ms per tick when the server starts up, with this change it is 400-500ms.
Also, some promises were not being waited for. It doesn't look like anything actually used them right after, so that probably never caused any issues, but this way should be a bit safer.