Fix data event parsing & add host

[bertrandda]

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Description of change

This PR:

• improve requests to retrieve events, by adding Content-Type header with application/xml as value (mandatory for some hosts).
• fix how data extraction is done for events because hosts do not use always the same tags to format data (, cal:calendar-data...) now we use regex
• add hosts to help during configuration (Google Calendar & Synology)

[codecov]

Codecov Report

Merging #754 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   92.71%   92.78%   +0.06%     
==========================================
  Files         419      419              
  Lines        5421     5416       -5     
==========================================
- Hits         5026     5025       -1     
+ Misses        395      391       -4     

Impacted Files	Coverage Δ
.../services/caldav/lib/calendar/calendar.requests.js	100.00% <100.00%> (+10.52%)	⬆️
.../caldav/lib/calendar/calendar.syncUserCalendars.js	98.14% <100.00%> (ø)

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[Pierre-Gilles]

Hey!

Thanks for the fixes 🙂

It seems that your code coverage is a little bit low, do you see how to fix it?

[bertrandda]

Hey!

Thanks for the fixes 🙂

It seems that your code coverage is a little bit low, do you see how to fix it?

I'm back, and try to fix that.