this PR adds an @AfterExtras annotation, that works similar to @AfterInject, but the methods are called every time a new intent is set to the activty by setIntent(Intent intent).

this allows an activity to get notified about new intents and so new extras.

the generated code looks like this

    private void injectExtras_() {
        Bundle extras_ = getIntent().getExtras();
        if (extras_!= null) {
            if (extras_.containsKey(OPEN_ALARMCLOCK_EXTRA)) {
                openAlarmclock = extras_.getBoolean(OPEN_ALARMCLOCK_EXTRA);
            }
            myAfterExtraMethod();
        }
    }

for multiple extras and/or methods, first all extras get injected and then the methods get called.

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent);
    }

currently known "issues", the first call to an @AfterExtras annotated method does not yet have @Bean fields set. this would require to move the ExtraHandler below the BeanHandler in AnnotationHandlers. i don't think that this would cause any issues. but i'll open a seperate PR for this change.