add support for oauth2 authentication MS Office uses

[adamdruppe]

not fully tested but based on some python that works

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (5c1df1c) 15.20% compared to head (11351ec) 15.16%.

❗ Current head 11351ec differs from pull request most recent head 1e4ec6c. Consider uploading reports for the commit 1e4ec6c to get more accurate results

Files	Patch %	Lines
source/symmetry/imap/request.d	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   15.20%   15.16%   -0.05%     
==========================================
  Files          12       12              
  Lines        1427     1431       +4     
==========================================
  Hits          217      217              
- Misses       1210     1214       +4     

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[adamdruppe]

a test proves i did miss an important detail but it works now, gonna push through.