Version 1.3.0 | New highlevel C++ API!

New highlevel API for C++ Backend

You can access more easy to Mess containers, write bytes and read.
Mess::<Proto>::High::Writer and Mess::<Proto>::High::Reader
For usage add argument -hl or --highlevel-api or
In Cmake: set(MESS_CPP_HIGHLEVEL_API 1) (d72f6b7)

And...

• Backend can now add arguments for their usage (b7c4083)
  (see to CppBackend get_arguments and process_arguments in file backend.py
• Removed some asserts from cpp backend. It causes some errors (8fc3420)

Full Changelog: v1.2.0...v1.3.0