general: replace auto_scope_leave_caller with scope_guard

And replace unused inclusions of misc_language.h

src/rpc/core_rpc_server.cpp

@@ -31,7 +31,6 @@
 #include <boost/preprocessor/stringize.hpp>
 #include <boost/uuid/nil_generator.hpp>
 #include <boost/filesystem.hpp>
-#include "include_base_utils.h"
 #include "string_tools.h"
 using namespace epee;
 
@@ -48,7 +47,6 @@ using namespace epee;
 #include "cryptonote_basic/cryptonote_basic_impl.h"
 #include "cryptonote_basic/merge_mining.h"
 #include "cryptonote_core/tx_sanity_check.h"
-#include "misc_language.h"
 #include "net/local_ip.h"
 #include "net/parse.h"
 #include "storages/http_abstract_invoke.h"