Cleanups:

* Reduce Beast dependencies
* Remove unnecessary includes
* Don't use deprecated bassert macros
* Don't use beast::String in Json::Value

src/ripple/rpc/Status.h

@@ -22,6 +22,7 @@
 
 #include <ripple/protocol/TER.h>
 #include <ripple/protocol/ErrorCodes.h>
+#include <cassert>
 
 namespace ripple {
 namespace RPC {

src/ripple/rpc/tests/Status.test.cpp

@@ -21,6 +21,7 @@
 #include <ripple/rpc/Status.h>
 #include <ripple/basics/contract.h>
 #include <beast/unit_test/suite.h>
+#include <algorithm>
 
 namespace ripple {
 namespace RPC {