Option to re-sync appointments in gCal

[Valentina R]

Useful when:

• user does a gCal sync after already having some appointments
• user changes the gCal and needs to re-sync to a new gCal integration

This has been requested any times. The last time is here.

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[Valentina R]

A user said that it helps if you manually edit an appointment or event. I didn’t test it yet.