Bugfix 1593882 and 1593883 - projector authorization backport
- Fix exception when authenticated connection requested and pin is None
- Fix pjlink authentication (use python hash instead of qt hash)
- Fix md5_hash functions
- Fix qmd5_hash functions
- Added tests for bugfixes
--------------------------------
lp:~alisonken1/openlp/2.4-bug-1593883-projector-authentication (revision 2637)
[SUCCESS] https://ci.openlp.io/job/Branch-01-Pull/1630/
[SUCCESS] https://ci.openlp.io/job/Branch-02-Funct...