standardize arrow functions, use implicit types where applicable

src/ViewModel/Pages/boardViewModel.ts

@@ -16,7 +16,7 @@ import TaskViewModel from "./taskViewModel";
 import { CommonKeys } from "../../View/keystrokes";
 
 export default class BoardViewModel extends TaskContainingPageViewModel {
-    contextDebugDescription = "board";
+    contextDebugDescription: string = "board";
 
     // state
     name: React.State<string> = new React.State("");

src/ViewModel/Pages/taskContainingPageViewModel.ts

@@ -11,7 +11,7 @@ import TaskViewModel from "./taskViewModel";
 
 export default class TaskContainingPageViewModel extends Context {
     // state
-    taskIndexManager: IndexManager<TaskViewModel> = new IndexManager(
+    taskIndexManager = new IndexManager<TaskViewModel>(
         (taskViewModel: TaskViewModel) => taskViewModel.sortingString,
     );
 

src/ViewModel/Pages/taskPageViewModel.ts

@@ -11,10 +11,10 @@ import { IndexManager } from "../../Model/Utility/utility";
 import { CommonKeys } from "../../View/keystrokes";
 
 export default class TaskPageViewModel extends ContextHost<string> {
-    contextDebugDescription = "task-page";
+    contextDebugDescription: string = "task-page";
 
     // data
-    boardIndexManager: IndexManager<BoardViewModel> = new IndexManager(
+    boardIndexManager = new IndexManager<BoardViewModel>(
         (boardViewModel: BoardViewModel) => boardViewModel.name.value,
     );