[Vue] Add persistence to configuration form

[jvalls-axa]

Each time a file is uploaded custom configuration is lost, in the development time a custom configuration is required to test Parsr behaviour and is a nightmare the fact to lose that each upload.

I would like to reuse current custom configuration for multiple uploads and I would like to have a "reset" button to set again the default configuration.

This feature can be quickly done by moving custom configuration state from component "/views/Upload" to sore "/vuex/Store".

[jvalls-axa]

It's just a nice to have but not an essential feature