This calls Java code on Android through the Qt JNI bridge
in order to learn the phone-wide setting of dark-theme.
For new installs this will now follow the phone setting by default.
Add GuiSettings: dark mode option.
The feature to show only the exchange-rate based value on the
main screen doesn't make sense on anything but mainnet due to
the simple fact that thats the only one that has an exchange rate.
We hide the feature on testnet and make it always show the BCH
value on the overview screens.
Notice that the actuall setting, as written in the config file,
is shared between chains. We only have one confg file. So any
solution with default values would not work.
On the main screen, also known as the "Activity view" this allows the
user to choose to only see fiat or see both Bitcoin Cash and fiat values
listed next to each transaction.
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.
tomFlowee