(core) Configure more comprehensive eslint rules for Typescript

Summary:
- Update rules to be more like we've had with tslint
- Switch tsserver plugin to eslint (tsserver makes for a much faster way to lint in editors)
- Apply suggested auto-fixes
- Fix all lint errors and warnings in core/, app/, test/

Test Plan: Some behavior may change subtly (e.g. added missing awaits), relying on existing tests to catch problems.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D2785

app/server/lib/DocPluginManager.ts

@@ -65,7 +65,12 @@ export class DocPluginManager {
   private _pluginInstances: PluginInstance[];
 
 
-  constructor(private _localPlugins: LocalPlugin[], private _appRoot: string, private _activeDoc: ActiveDoc, private _server: GristServer) {
+  constructor(
+    private _localPlugins: LocalPlugin[],
+    private _appRoot: string,
+    private _activeDoc: ActiveDoc,
+    private _server: GristServer
+  ) {
     this.gristDocAPI = new GristDocAPIImpl(_activeDoc);
     this._pluginInstances = [];
     this.ready = this._initialize();