[WIP] Synchronize time with Jetson using UDP

[snowsignal]

This is still a work in progress, but I'm making a PR now to get some early feedback on this. This fixes issue #61.

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• [ ] Test code changes on the robot (if possible).

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Thanks!

[snowsignal]

@andrewda, this can already broadcast as well. If we set JETSON_IP to either the universal broadcast address 255.255.255.255 or the subnet broadcast address (which depends on the IP of the network), the message will be broadcasted across the local network (as long as a router doesn't block it). However, most WiFi routers will block UDP requests, so it's better to set the IP to localhost for testing.

[andrewda]

I think we'll be fine with 10.25.21.255 (again, value should be set in constants.kt).

[snowsignal]

I've also updated time-sync-server to be compatible with these changes.

[snowsignal]

Should I write tests?

[andrewda]

@JacksonCoder Eh, not necessary for this. And besides we don't really have any tests on this repo. Next year, though... Oh man we're gonna test everything ;).