reenable unittest for mangle/demangle
Fixes Issue 9699 - Implement generic strip/stripLeft/stripRight functions which accept an element or a predicate.
Fixes Issue 11123 - std.getopt should support function callbacks.
Merge pull request #1311 from AndrejMitrovic/Fix9699_2

Issue 9699 - Implement generic strip/stripLeft/stripRight functions
Merge pull request #1601 from AndrejMitrovic/Fix11123

Issue 11123 - std.getopt should support function callbacks.
fix property enforcement
Merge pull request #1604 from 9rnsr/enforceProp

fix property enforcement
Merge pull request #1595 from rainers/reenable_demangle_test

reenable unittest for mangle/demangle