Fix 34532

Added a check if encodingType is null to allow it to retrieve the default
encoding.
Fix 34616

Updated pdb.py and test_pdb.py to match the code in the CPython patch.
Merge pull request #159 from slide/master

Fix 34532
Merge pull request #160 from slide/master

Fix 34616
Fix 33627

Fixed the logic when an existing dialect is passed in with keyword args as
well
Merge pull request #161 from slide/master

Fix 33627
Have List and PythonTuple implement IReadOnlyList when compiled for .NET 4.5
Merge remote-tracking branch 'MBradbury/master'
Fix 34571

Switched to UTF8.GetString from using the ASCII encoding. Also, stopped
skipping a test that was dependent on another fix for empty zips.
Merge branch 'master' of https://github.com/IronLanguages/main
Merge pull request #165 from slide/master

Fix 34571
added support for struct format strings of type bytes
Improve Mono builds.
Merge remote-tracking branch 'jbester/master'