Add override callback for checkPasscode & setPasscode

[bertrandmartel]

I needed to have a different process to manage checkPasscode & setPasscode so I added callback for each of those 2 methods. A sample usecase of this would be a SIM application that holds the pincode, in that case, the pin code shouldn't be stored in SharedPreferences since the pin code is checked and set on the SIM card.

Exemple in onCreate of CustomPinActivity :

LockManager<CustomPinActivity> lockManager = LockManager.getInstance();
lockManager.getAppLock().setCallback(new ILockCallback() {
    @Override
    public boolean onCheckPasscode(String inputPasscode) {
        //check pin code on SIM card
        return false;
    }

    @Override
    public boolean onSetPasscode(String passcode) {
        //set pin code on SIM card
        return false;
    }
});

[bertrandmartel]

For reference, the project where I used this : https://github.com/bertrandmartel/sim-password-wallet