Lua: Add "printToOutputPane" plugin option

Allows a plugin to automatically forward the "print" command to
the output pane instead of only to qDebug()

Change-Id: I10fb8063bc1713eaaf77368ea7f760270df190b3
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/lua/luapluginspec.cpp

@@ -138,4 +138,9 @@ ExtensionSystem::IPlugin::ShutdownFlag LuaPluginSpec::stop()
 
 void LuaPluginSpec::kill() {}
 
+bool LuaPluginSpec::printToOutputPane() const
+{
+    return d->pluginTable.get_or("printToOutputPane", false);
+}
+
 } // namespace Lua