Terrain brush implemented.

tilorswift/js/events/TilorswiftEvent.js

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+const TilorswiftEvent = {
+    FIELD_CLICKED: 'fieldclicked',
+    FIELD_ENTERED: 'fieldentered',
+};
+
+export default TilorswiftEvent;

tilorswift/js/events/TilorswiftFieldClickedEvent.js

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+import TilorswiftEvent from "./TilorswiftEvent.js";
+
+export default class TilorswiftFieldClickedEvent extends CustomEvent
+{
+    constructor(field)
+    {
+        super(
+            TilorswiftEvent.FIELD_CLICKED,
+            {
+                detail: {field: field}
+            }
+        );
+    }
+
+    getField()
+    {
+        return this.detail.field;
+    }
+}

tilorswift/js/events/TilorswiftFieldEnteredEvent.js

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+import TilorswiftEvent from "./TilorswiftEvent.js";
+
+export default class TilorswiftFieldEnteredEvent extends CustomEvent
+{
+    constructor(field) {
+        super(
+            TilorswiftEvent.FIELD_ENTERED,
+            {
+                detail: {field: field}
+            }
+        );
+    }
+
+    getField()
+    {
+        return this.detail.field;
+    }
+}