Refs #8030. Make it possible to set a tooltip for prop without value
Refs #8030. Set function tooltips to their high-level structure string
Refs #8030. Fix function removal update
Refs #8030. Show structure of base CompositeFunction only

We don't need to display structure of it's derivates (e.g. Convolution),
apart from ProductFunction.
Merge remote-tracking branch 'origin/feature/8030_fit_browser_high_level_formula'