Implemented fog saving

core/src/io/anuke/mindustry/net/NetworkIO.java

@@ -96,6 +96,28 @@ public class NetworkIO{
                 }
             }
 
+            //write visibility, length-run encoded
+            for(int i = 0; i < world.width() * world.height(); i++){
+                Tile tile = world.tile(i);
+                boolean discovered = tile.discovered();
+
+                int consecutives = 0;
+
+                for(int j = i + 1; j < world.width() * world.height() && consecutives < 32767*2-1; j++){
+                    Tile nextTile = world.tile(j);
+
+                    if(nextTile.discovered() != discovered){
+                        break;
+                    }
+
+                    consecutives++;
+                }
+
+                stream.writeBoolean(discovered);
+                stream.writeShort(consecutives);
+                i += consecutives;
+            }
+
             //write team data
             stream.writeByte(state.teams.getTeams().size);
             for(TeamData data : state.teams.getTeams()){
@@ -215,6 +237,18 @@ public class NetworkIO{
                 tiles[x][y] = tile;
             }
 
+            for(int i = 0; i < width * height; i++){
+                boolean discovered = stream.readBoolean();
+                int consecutives = stream.readUnsignedShort();
+                if(discovered){
+                    for(int j = i + 1; j < i + 1 + consecutives; j++){
+                        int newx = j % width, newy = j / width;
+                        tiles[newx][newy].setVisibility((byte) 1);
+                    }
+                }
+                i += consecutives;
+            }
+
             player.reset();
             state.teams = new TeamInfo();