Simplify JSON sent

[coyotte508]

With engine.options.map, we now have the configurations (sectors, rotations).

We just need to send that configuration, and changes (transdim planets gaiaformed, and other extra data like buildings, federations...).

This would cut down a lot on network traffic & database storage.

This can be done on a toJSON() or toString() method of GaiaHex:

• only include planet if it's a gaia planet (as it may have been changed)
• include remaining data

Actually since the map is grouped into sectors, the export can be done like this:

[{"sector": "1", "data": [,,,{"planet": "gaia", "building": "m", "player": 0},,,,,{"federations": [1,2]},]}, ...]

There's no need to even serialize coordinates as we can extrapolate the info from the sector & the index of the hex

[coyotte508]

We can also, like with Take 6, only send log slices when a game is updated