UX: remember the last used "server URL", "mode" and "cache path"

[gioman]

Subject says it all. Possibly this is not necessary if the UI will become a panel(?).

[alexbruy]

There is no "server path" in the plugin UI. What do you mean by it?

And just for the record, this was not in the original requirements.

[gioman]

Sorry, I meant server URL.