Different tick schedules

We initially supported different tick speeds via alternate servers, but this proved to be too expensive to run. We should allow the main server to manage tick speeds as a galaxy setting, and update them according to their respective schedules.

discourse.imperialconflict.com

~~clean up tick script to support new changes~~

~~add tick interval to galaxy settings, in seconds~~

this will start on the “master galaxy” (not rounds) but eventually could be round-configurable
using seconds instead of minutes, in case we are ever able to consider sub-minute ticks

~~split tick script into different scheduled scripts, only running for relevant galaxies~~

~~if tick interval isn’t set, assume 3600 (1 hour)~~

~~test:~~

~~2 min galaxy~~

~~15 min galaxy~~

~~galaxy with no interval set (should be 1 hr)~~