Log errors when mounting views to the console for easier reference

From the console, I can click the source references in the stack trace
to jump to the spot in the code where things are going wrong.

It also helps with the problem of the error not having enough
space to be read in some components.

Split off from https://github.com/vector-im/hydrogen-web/pull/653

src/platform/web/ui/general/utils.ts

@@ -22,6 +22,9 @@ export function mountView(view: IView, mountArgs?: IMountArgs): ViewNode {
     try {
         node = view.mount(mountArgs);
     } catch (err) {
+        // Log it to the console so it's easy to reference
+        console.error(err);
+        // Then render our error boundary to the DOM
         node = errorToDOM(err);
     }
     return node;