feat(swdash): Add SW-Dash (Lit-based service worker dashboard), bundle & serve it; improve servertools and static handlers

ts_swdash/plugins.ts

@@ -0,0 +1,15 @@
+// Lit imports
+import { LitElement, html, css } from 'lit';
+import type { CSSResult, TemplateResult } from 'lit';
+import { customElement, property, state } from 'lit/decorators.js';
+
+export {
+  LitElement,
+  html,
+  css,
+  customElement,
+  property,
+  state,
+};
+
+export type { CSSResult, TemplateResult };