Just Map Unlimited

- updated to 1.16.3;

- improved color extraction algorithm;

- saving colors to the palette and to the disk;

- fixed freezes while swapping map levels in the Nether and Caves;

- possible fixed #83;

- extended server side functionality. If map installed on the server clients can request slime chunks from the server;

- added shading for map icons depends on height difference (can be disabled in the config);

- added French translation;