Property type change is not allowed

Both in Figma and in QML one can imagine a scenario where some Component has a color that is bound to some `property color varname` in QML or to some variable in Figma.

Then, when it is instantiated someone may override this color with a color string, i.e. "#ffffff".

Currently the importer does not allow for that which limits some instance override scenarios.

I imagine that this would require some substantial endeavor to actually support it.