Add to google calendar rewrite

[gwydion67]

Rewrite the logic used to add to google calendar.
Now uses the ICS file from generate_ics to insert events into the google calendar
Main benefits :

• more robust login and better error view
• adding event types in future will be faster since only need to update the generate_ics part
• option to add the calendar name as argument when running gyft.py, this calendar must be created beforehand on the google calendar website else the primary calendar will be used

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Google Calendar importing now asks if full calendar is to imported or only the current semester

[proffapt]

full calendar is to imported or only the current semester

what does full and current mean here?

[gwydion67]

full calendar is to imported or only the current semester

what does full and current mean here?

Full : all events (both semestersl
Current : if the date of executing the code is before end of midsems then events before mids or if the date is after mids then put in entries from midsems to end sems

[gwydion67]

I have improve on this logic, I want to remove the hard coded mid and end sems date and get them from the academic calendar but need that pr (fetch academic calendar #147 ) to be merged first

[proffapt]

Implement necessary frontend changes as well.

[proffapt]

• Add a button to connect with calendar in frontend and integrate with backend.
• Remove the hardcoded dates dependency and parse it from the academic calendar data
• make sure that for a year this will be run twice.. so it doesn't duplicate the holidays and other events from the calendar.

[proffapt]

do the first step in this same PR

for the remaining 2 steps, make a separate PR