Copy the appropriate .ui file into demo/resources/filterpanel.ui
copy parts of the Python code in tiled-viz2023/gemviz23/filter_function.py to demo/filterpanel.py
We may want to make the filterpanel UI such that it is loaded in the mainwindow using the same kind of commands as the runs and visualization panels (wrap the filter panel in a QScrollArea)
Integrate the filter UI QWidget into the demo application