Freeciv 3DS v0.1.0 - first public release

The Freeciv engine (rulesets, map generator, AI - no desktop client) runs
cross-compiled to the 3DS's ARM11, in-process with a custom libctru/citro2d
client across both screens.

Playable:
- New Game / Load Game, turn-based play, AI opponents
- Full map rendering: terrain, coastlines, fog-of-war, borders, overlays
- Unit control incl. multi-turn goto pathing
- City management: production, buy, worklist, garrison
- Research (with a tech-tree view), tax rates, government & revolutions
- Diplomacy with AI players (propose / accept / cancel)
- Save/Load to the SD card with a newest-first picker
- HOME suspend/resume safe
- A "dev" quick-game preset (hold L+R + New Game) for fast test games

Hardware: developed and tested on a New 3DS. Should run on an Old 3DS with
CFW too (nothing in the code is New-3DS-only, see README) but that has not
been tested yet.

Known limitations: a top-screen minimap is in development and not included
in this release. See the open issues noted in the README for the rest.