Make clear map function name more concise

Renam resetting the grid to clearMap.

test/simulation_test.dart

@@ -1,9 +1,9 @@
 import 'dart:math';
+
 import 'package:mockito/mockito.dart';
 import 'package:rules_of_living/src/Grid.dart';
-import 'package:test/test.dart';
-
 import 'package:rules_of_living/src/Simulation.dart';
+import 'package:test/test.dart';
 
 class MockGrid extends Mock implements Grid<bool> {}
 
@@ -25,20 +25,20 @@ void main() {
       var oldMap = sut.map;
       sut.gridSize = Point(10, 10);
       expect(sut.map, isNot(same(oldMap)));
-    });
+    }, tags: "nobrowser");
   });
   group("resetMap", () {
     test("sets the internal map filled with 'false' ", () {
       sut.map.set(1, 1, true);
-      sut.reset();
+      sut.clearMap();
       expect(sut.map, allOf(TypeMatcher<Grid>(), isNot(contains(true))));
     });
     test("sets the simulation to need re-rendering", () {
       sut.dirty = false;
-      sut.reset();
+      sut.clearMap();
       expect(sut.dirty, true);
     });
-  });
+  }, tags: "nobrowser");
   group("save&load", () {
     test(
         "saves a copy of the map which does not change when the actual map changes",
@@ -49,5 +49,5 @@ void main() {
 
       expect(sut.loadSnapshot(), isNot(equals(snapshot)));
     });
-  });
+  }, tags: "nobrowser");
 }