Industrial Qt Quick components

To compile and run the demo:

- Create the directory where you want to build the project ("mkdir indigets-build && cd indigets-build")
- Configure with "cmake <path-to-sources>" from the build directory
- Compile with "make"
- Run the demo with the QML Viewer executable ("qmlviewer -I <plugin-build-dir> -I <indigets-dir> <indigets-dir>/demo/examples/demo1.qml")