The ImportWalletPage now loads the QML provided by the module,
exposed via the metadata of modules.
The module gets just a blockheight property and then will do
"its thing".
This will either instantly close when there is nothing to do
and continue instantly to the actual import.
Or the module will check the server, initiate download and when
all is setup and done THEN close the popup and continue with
the actual import.
We moved the initial-sync-height from the view to the model, which gives
a more logical progress update when switching between accounts.
Also added a button on the listview to instantly jump to the top of the
list.
tomFlowee