This redoes most of those pages to look much nicer and in-place.
This also disables the 'create' button when the derivation path is not
correctly entered.
This exports the payment-request address to the QML side.
We use this to show under the QR the address we are requesting to send
to.
This is quite useful for users wanting to manually check if things are
going well.
In Qt5 the palette was introduced in the Control object (part of Qt-
Quick-Controls-2).
In Qt6 this property was moved to the superclass 'Item'.
This means that we no longer need to refer to a control when using a
palette, every single thing in QtQuick is an Item, afterall.
This works around the weirdness that we can inherit from Page, while the
children are actually added to a separate item and that caused confusion
when the sizes of those two were not equal.
This is now fixed, at least for the width.
For all times we start with a completely empty Flowee Pay, show a
landing page which guides the user to create a new wallet or deposit
funds into the default wallet.
tomFlowee