Complete redo of content indexing and querying (#517)

Complete redo of data store
Introduces live queries and live templates

web/syscalls/widget.ts

@@ -0,0 +1,22 @@
+import { SysCallMapping } from "../../plugos/system.ts";
+import { Client } from "../client.ts";
+
+export function widgetSyscalls(
+  client: Client,
+): SysCallMapping {
+  return {
+    "widget.render": (
+      _ctx,
+      lang: string,
+      body: string,
+    ): Promise<{ html: string; script: string }> => {
+      const langCallback = client.system.codeWidgetHook.codeWidgetCallbacks.get(
+        lang,
+      );
+      if (!langCallback) {
+        throw new Error(`Code widget ${lang} not found`);
+      }
+      return langCallback(body);
+    },
+  };
+}