Hex <-> Coordinates conversion for scripts

[Suicide Junkie]

If you want to convert hex IDs into system map coordinates, you'll need these functions

Useful for:
- Moving ships a certain number of hexes (In GGmod, ships ending turn on a warppoint are shoved 1 hex in a random direction so that chokepoints aren't.
- Swirling ships around as they go down into the black hole.
- If you wanted to, you could make planets orbit their stars, although it would tend to cause trouble with ship navigation
- Stargates. Players can dial an address using map coords, and you can now figure out what hex ID you need to use for the warppoint's destination.