Initial support for themes, sound improvements

src/js/game/themes/dark.json

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+{
+    "uiStyle": "dark",
+    "map": {
+        "background": "#2e2f37",
+        "grid": "rgba(255, 255, 255, 0.02)",
+        "gridLineWidth": 0.5,
+
+        "resources": {
+            "shape": "#3d3f4a",
+            "red": "#4a3d3f",
+            "green": "#3e4a3d",
+            "blue": "#35384a"
+        }
+    },
+
+    "items": {
+        "outline": "#111418",
+        "outlineWidth": 0.75
+    }
+}

src/js/game/themes/light.json

@@ -0,0 +1,20 @@
+{
+    "uiStyle": "light",
+    "map": {
+        "background": "#fff",
+        "grid": "#fafafa",
+        "gridLineWidth": 1,
+
+        "resources": {
+            "shape": "#eaebec",
+            "red": "#ffbfc1",
+            "green": "#cbffc4",
+            "blue": "#bfdaff"
+        }
+    },
+
+    "items": {
+        "outline": "#55575a",
+        "outlineWidth": 0.75
+    }
+}