Fixes on chat/history/conferences section date timezone and conferences creation timezone:

Merged Julien Wadel requested to merge fix/timezones_51 into release/5.1
  • Remove timezone variable as it is not stored into database. Use it only when building the conference date (which is in UTC).
  • Replace javascript managment on dates by Qt in C++ because of timezone complexity that can be different from C++ and QML.
  • Remove the buggy autocheck on conference creation time.

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