Remove boost dependency (boost/assign/std/vector.hpp)

Github-Pull: #13545
Rebased-From: 962d8ee

Author: practicalswift

src/test/streams_tests.cpp

@@ -6,11 +6,8 @@
 #include <support/allocators/zeroafterfree.h>
 #include <test/test_bitcoin.h>
 
-#include <boost/assign/std/vector.hpp> // for 'operator+=()'
 #include <boost/test/unit_test.hpp>
 
-using namespace boost::assign; // bring 'operator+=()' into scope
-
 BOOST_FIXTURE_TEST_SUITE(streams_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(streams_vector_writer)
@@ -80,25 +77,25 @@ BOOST_AUTO_TEST_CASE(streams_serializedata_xor)
 
     // Degenerate case
 
-    key += '\x00';
-    key += '\x00';
+    key.push_back('\x00');
+    key.push_back('\x00');
     ds.Xor(key);
     BOOST_CHECK_EQUAL(
             std::string(expected_xor.begin(), expected_xor.end()), 
             std::string(ds.begin(), ds.end()));
 
-    in += '\x0f';
-    in += '\xf0';
-    expected_xor += '\xf0';
-    expected_xor += '\x0f';
+    in.push_back('\x0f');
+    in.push_back('\xf0');
+    expected_xor.push_back('\xf0');
+    expected_xor.push_back('\x0f');
 
     // Single character key
 
     ds.clear();
     ds.insert(ds.begin(), in.begin(), in.end());
     key.clear();
 
-    key += '\xff';
+    key.push_back('\xff');
     ds.Xor(key);
     BOOST_CHECK_EQUAL(
             std::string(expected_xor.begin(), expected_xor.end()), 
@@ -108,17 +105,17 @@ BOOST_AUTO_TEST_CASE(streams_serializedata_xor)
 
     in.clear();
     expected_xor.clear();
-    in += '\xf0';
-    in += '\x0f';
-    expected_xor += '\x0f';
-    expected_xor += '\x00';
+    in.push_back('\xf0');
+    in.push_back('\x0f');
+    expected_xor.push_back('\x0f');
+    expected_xor.push_back('\x00');
 
     ds.clear();
     ds.insert(ds.begin(), in.begin(), in.end());
 
     key.clear();
-    key += '\xff';
-    key += '\x0f';
+    key.push_back('\xff');
+    key.push_back('\x0f');
 
     ds.Xor(key);
     BOOST_CHECK_EQUAL(