refactor: rename states to view controllers (#1060)

app/assets/javascripts/Controllers/Abstract/AbstractViewController.ts

@@ -0,0 +1,14 @@
+import { DeinitSource } from '@standardnotes/snjs'
+import { WebApplication } from '../../Application/Application'
+
+export abstract class AbstractViewController {
+  dealloced = false
+
+  constructor(public application: WebApplication, public viewControllerManager?: AbstractViewController) {}
+
+  deinit(_source: DeinitSource): void {
+    this.dealloced = true
+    ;(this.application as unknown) = undefined
+    ;(this.viewControllerManager as unknown) = undefined
+  }
+}