restructure presentation layer

- Move most GUI related code to /presentation
- Move components to /components (separate from bootstrap and style)
- Move shared components helpers to /components/shared
- Rename Bootstrapping to bootstrapping to enforce same naming
  convention in /presentation

src/presentation/components/Shared/StatefulVue.ts

@@ -0,0 +1,37 @@
+import { Component, Vue } from 'vue-property-decorator';
+import { AsyncLazy } from '@/infrastructure/Threading/AsyncLazy';
+import { IApplicationContext } from '@/application/Context/IApplicationContext';
+import { buildContextAsync } from '@/application/Context/ApplicationContextFactory';
+import { IApplicationContextChangedEvent } from '@/application/Context/IApplicationContext';
+import { ICategoryCollectionState } from '@/application/Context/State/ICategoryCollectionState';
+import { EventSubscriptionCollection } from '@/infrastructure/Events/EventSubscriptionCollection';
+
+// @ts-ignore because https://github.com/vuejs/vue-class-component/issues/91
+@Component
+export abstract class StatefulVue extends Vue {
+    private static readonly instance = new AsyncLazy<IApplicationContext>(() => buildContextAsync());
+
+    protected readonly events = new EventSubscriptionCollection();
+
+    private readonly ownEvents = new EventSubscriptionCollection();
+
+    public async mounted() {
+        const context = await this.getCurrentContextAsync();
+        this.ownEvents.register(context.contextChanged.on((event) => this.handleStateChangedEvent(event)));
+        this.handleCollectionState(context.state, undefined);
+    }
+    public destroyed() {
+        this.ownEvents.unsubscribeAll();
+        this.events.unsubscribeAll();
+    }
+
+    protected abstract handleCollectionState(
+        newState: ICategoryCollectionState, oldState: ICategoryCollectionState | undefined): void;
+    protected getCurrentContextAsync(): Promise<IApplicationContext> {
+        return StatefulVue.instance.getValueAsync();
+    }
+
+    private handleStateChangedEvent(event: IApplicationContextChangedEvent) {
+        this.handleCollectionState(event.newState, event.oldState);
+    }
+}