QtVirtualKeyboard needs to use declarative type registration and stop using qmlplugindump to generate qmltypes files in order for it to be compatible with qml tooling (and the compiler).

Some pointers:

• Make the plugin (src/import) optional like done in this change OR merge the plugin part into the actual library
  • You might need to turn the C++ types into an extra .impl module for this to work
• Create a proper module structure since you can't register qml files anymore and install all your qml files instead of just bundling them with the library