v0.19

[Ko van der Sloot]

• Bumped library version to 5.0
• SocketBasics:
  • invalidate sockets, when something looks not OK
• Unicode:
  • added Unicode (UTF8) aware versions of uppercase() and lowercase()
    added a UnicodeString splitter, analogue to the 'old' TiCC::split()
    functions
  • added icu:: namespace (required for ICU61 and up)
  • fixed a problem with Transcriptor rules not handled correctly.
• Small edits to fix some compiler warnings.
• fixed potential memory leaks in Trie.h and Tar.cxx
• CommandLine:
  • implemented gnu-like extensions in command-line parsing.
    (intermixing mass options with normal options)
• added tests for the new features/functions.
  [Maarten van Gompel]
• added codemeta.json file