qtwebutils::queryString() -> QString
   
  Returns the query string as a QString: 
      "?u=123&v=abc"

qtwebutils::searchParameters() -> QHash<QString, QString>

  Returns the search parameters in a QHash: 
      "u" ->  "123"
      "v" ->  "abc"

Include qt_qml_imports.json which preloads libquickwindowplugin.so

Include qt_plugins.json which loads the platform plugin

Minimal QPluginLoader on-demand loading.

The Emscripten entry function name is now unique based
on the application name ("$APPNAME_entry"), and must be
specified when creating the wasm instance.

Also some drive-by fixes.

Don't call exec(), instead allocate objects on the
heap and then delete at quit() time.

This is a work in progress. This example shows how to
load a basic Qt Quick application using shared libraries
with pre-loaded Qt plugins, and also how to load a plugin
on demand.

See documentation at the doc snapshots for how to build
Qt and this example

https://doc-snapshots.qt.io/qt6-dev/wasm.html#shared-libraries-and-dynamic-linking-developer-preview

Note that this checkin contains generated plugin preload lists
(qt_plugins.json and qt_qml_imports.json). This means that
running the scripts to generate them may be skipped.

We want to re-use examples/testapp/testapp.wasm to avoid
having to build the sample app several times.

Emscripten loads the wasm file relative to the html
file, and not relative to the app.js file.

Create a symlink in each of the example directories
which points to the (one) testapp.wasm.

Qt has some layout issues with padding

(Don't call default event handlers which reject the
event)

application windows on an html document.

(note requires Qt 6.5.1 for qtloader.js fixes)

Some of the Qt elements now have a positive z-order,
which means we have to fully specify the z-order for
the window container and resize area in order to make
sure the resize area appears on top.

This example shows how to create a popup window (or tab)
with application content.

Add qtwebutils::openBrowserWindow() and closeBrowserWindow()
utility functions which makes the native calls to window.open()
and window.close() using emscripten::val.

    
This example shows how to create multiple application
instances from a single wasm module.

    
This example show how to display multiple application
windows on a single web page.

This example show how to load an application in the background,
while initial page content is displayed.

Add helper functions as well as QML singleton.