Fix hang of calendar/fwconsole process

[Massi-X]

As long-windedly discussed on FreePBX forum the last updates (16.0.23 and up) caused hanging of the fwconsole process and the inability to view the calendar inside the admin UI. This was in particular true only for a specific type of events that contains the following (omitted non relevant values):

[DTSTART] => DateTime Object
    (
        [date] => 2022-12-02 08:30:00.000000
        [timezone_type] => 3
        [timezone] => America/New_York
    )
[DTEND] => DateTime Object
    (
        [date] => 2022-12-02 14:00:00.000000
        [timezone_type] => 3
        [timezone] => America/New_York
    )
[RRULE] => Array
    (
        [FREQ] => MONTHLY
        [INTERVAL] => 1
        [UNTIL] => DateTime Object
            (
                [date] => 2022-12-04 00:00:00.000000
                [timezone_type] => 2
                [timezone] => Z
            )

        [BYMONTHDAY] => 2
    )

The UNTIL rule was causing the IcalParser library to fail and return an error that was not correctly handled by the code. Now a check is added for the return value and also to be sure that the returned value is greater than the start time of the event.

Inside the same PR I removed a goto statement in Base.php and fixed the return value of fastHandler() when no cache is available.

[Massi-X]

Hi I think the module should now be ready to publish? Me and ashcortech did extensively test it and it works fine