qt.util.ButtonsWidget: add custom setText arg to methods
qt.util.ButtonsWidget: add custom setText arg to methods

I am planning to use this in qt.PayToEdit.

spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum