Refactor views to support dynamic updates.

src/card-controller/view/modifiers/remove-context.ts

@@ -0,0 +1,15 @@
+import { ViewContext } from "view";
+import { View } from "../../../view/view";
+import { ViewModifier } from "../types";
+
+export class RemoveContextViewModifier implements ViewModifier {
+  protected _keys: (keyof ViewContext)[];
+
+  constructor(keys: (keyof ViewContext)[]) {
+    this._keys = keys;
+  }
+
+  public modify(view: View): void {
+    this._keys.forEach((key) => view.removeContext(key));
+  }
+}