- new panel created: `SwapInputPanel`
- some cleanups to the needed stores
- created a SB page demonstrating the use of 2 panels and the
`SwapExchangeButton`
- created QML tests
Fixes#14781
- teach `userInputLocale` about `Locale.OmitGroupSeparator` option which
discards the said thousands separator
- some more fixes to other inputs to do the same, and align what the
validators do
- StatusAmountInput: discard illegal characters, and reuse the same
locale for the validator
- StatusAmountInputPage: make it possible to select a different locale
Fixes#14165