DEV-1761: New rules API (#118)

* DEV-1761: Clean up Ruleset interface (#115)

* remove legacy ruleset types and simplify ruleset interface

* remove unnecessary settings argument from Ruleset interface

* decouple rules.Settings from client API and store settings as strings

* DEV 1761: Add new BoardState and Point fields (#117)

* add Point.TTL, Point.Value, GameState and PointState to BoardState

* allow maps to access BoardState.GameState,PointState

* add PreUpdateBoard and refactor snail_mode with it

* fix bug where an extra turn was printed to the console

* fix formatting

* fix lint errors

Co-authored-by: JonathanArns <jonathan.arns@googlemail.com>

client/testdata/snake_request.json

@@ -8,16 +8,16 @@
         "foodSpawnChance": 10,
         "minimumFood": 20,
         "hazardDamagePerTurn": 30,
-        "hazardMap": "hz_spiral",
-        "hazardMapAuthor": "altersaddle",
+        "hazardMap": "",
+        "hazardMapAuthor": "",
         "royale": {
           "shrinkEveryNTurns": 40
         },
         "squad": {
-          "allowBodyCollisions": true,
-          "sharedElimination": true,
-          "sharedHealth": true,
-          "sharedLength": true
+          "allowBodyCollisions": false,
+          "sharedElimination": false,
+          "sharedHealth": false,
+          "sharedLength": false
         }
       }
     },