arrows allow browsing the feature list in the attribute table in form view
the current edited feature can be highlighted and the map canvas automatically panned or zoomed
instead of QgsAttributeForm - because it's used on places not including QgsAttributeForm
now it's able to use @form_mode in expressions of containers and QML widgets
Checks whether a function declaration has parameters that are
top level const.
const values in declarations do not affect the signature of a
function, so they should not be put there.
