Player colors

[sarcoma]

@Stan`: As discussed in balance chat, maybe player colors could be customizable like this, in mod or a24

Would be nice if a color picker opens instead of writing raw rgb values. Could change gaia color too.
(I stole those blocks from fgod/gui/options/options.json)

            {
                "type": "color",
                "label": "Player 1 color",
                "tooltip": "Color of player 1.",
                "config": "gui.session.playercolors.one",
                "callback": "..something..."
            },

I don't know how to save those settings to simulation/data/settings/player_defaults.json
so I hard coded the values. Result

[Stan`]

Maybe @ffffffff wants to make a patch?