remove 'private' from src/core/CMakeLists.txt link_libs
Merge pull request #114 from da2ce7/fix_cmake_private

Fix CI build: remove 'private' from src/core/CMakeLists.txt link_libs
Made OT_ME interface more consistent.
Replaced last 4 int32_t return types with bool
Moved deps/anyoption/anyoption.cpp out of opentxs-client
Removed obsolete inline functions from ot_otapi_ot.hpp
Removed using directives from include files
Moved #defines out of namespace scope
Removed some unnecessary includes and variables