Levelization, improve structure of source files:

Source files are moved between modules, includes changed and added,
and some code rewritten, with the goal of reducing cross-module dependencies
and eliminating cycles in the dependency graph of classes.

* Remove RippleAddress dependency in CKey_test
* ByteOrder.h, Blob.h, and strHex.h are moved to basics/. This makes
  the basics/ module fully independent of other ripple sources.
* types/ is merged into protocol/. The protocol module now contains
  all primitive types specific to the Ripple protocol.
* Move ErrorCodes to protocol/
* Move base_uint to basics/
* Move Base58 to crypto/
* Remove dependence on Serializer in GenerateDeterministicKey
* Eliminate unity header json.h
* Remove obsolete unity headers
* Remove unnecessary includes

src/ripple/unity/json.cpp

@@ -34,8 +34,6 @@
 #include <ripple/json/impl/json_batchallocator.h>
 #endif
 
-#include <ripple/unity/json.h>
-
 #define JSON_ASSERT_UNREACHABLE assert( false )
 #define JSON_ASSERT( condition ) assert( condition );  // @todo <= change this into an exception throw
 #define JSON_ASSERT_MESSAGE( condition, message ) if (!( condition )) throw std::runtime_error( message );