overall security improvement

[ErgoTester]

1-after creating a new wallet in the encryption page add bellow the save device-encrypted a
warning: changing the device security might lead to "lost access to your wallet" or something simillar
2-in wallet configuration disable screenshot for display public/mnemonic
3-in wallet configuration deleting a wallet should require a password or fingerprint
4-add a pop up message that the storage rent is activated when opening the app with an option to not show this again