Hexes, Small Worlds, Subsector Names

I made three quick additions to ring in the new year:

• Non-empty hexes now include the hex number (e.g. Reference/Core has 0140); this does make the display a bit more cluttered but it's far more usable when trying to navigate
• Small worlds - worlds with UWP size code "S", for example e.g. Gateway /Gateway 1220 - now render with the "Asteroid Belt" glyph. There doesn't appear to be a standard for these, but it was definitely wrong before.
• Subsector names are now displayed when zoomed in. I'm not happy with the appearance, so suggestions are welcome. Also, only a few sectors have subsector names listed; I'm adding them to the data file a few at a time.

Let me know what you think!

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