Add custom SliderSpinner QML control.

Also, remove label from Preset control and touchup all filter QML files.
Add tooltip to color swatch button.
Fix undo on SliderSpinner.
Revert "Workaround Stabilize filter crash at end of analysis on Windows."

This reverts commit 130084bf9bd842824c60cca0a32245752cf518d5.
Clean up remaining relics from QML conversion