bugfix-4995
Added the RandomFile class for creating, saving and reading wallet backups. Added walletRecoveryType parameter to DapDashboardTab.qml. One dapButtonAction button has been added to DapRecoveryWalletRightPanelForm (instead of Copy, Paste, Save, Load). The DapRecoveryWalletRightPanelForm changes depending on the walletRecoveryType. Added dialogs for getting the name of the saved and loaded file. Messages about saving and loading the file are processed.