remove unused class util::Ref and its unit test

Author: theStack

src/Makefile.am

@@ -243,7 +243,6 @@ BITCOIN_CORE_H = \
   util/moneystr.h \
   util/rbf.h \
   util/readwritefile.h \
-  util/ref.h \
   util/settings.h \
   util/sock.h \
   util/spanparsing.h \

src/Makefile.test.include

@@ -110,7 +110,6 @@ BITCOIN_TESTS =\
   test/prevector_tests.cpp \
   test/raii_event_tests.cpp \
   test/random_tests.cpp \
-  test/ref_tests.cpp \
   test/reverselock_tests.cpp \
   test/rpc_tests.cpp \
   test/sanity_tests.cpp \

src/test/ref_tests.cpp

@@ -57,7 +57,6 @@ IGNORED_WARNINGS=(
     "src/test/checkqueue_tests.cpp:.* Struct 'UniqueCheck' has a constructor with 1 argument that is not explicit."
     "src/test/fuzz/util.h:.* Class 'FuzzedFileProvider' has a constructor with 1 argument that is not explicit."
     "src/test/fuzz/util.h:.* Class 'FuzzedAutoFileProvider' has a constructor with 1 argument that is not explicit."
-    "src/util/ref.h:.* Class 'Ref' has a constructor with 1 argument that is not explicit."
     "src/wallet/db.h:.* Class 'BerkeleyEnvironment' has a constructor with 1 argument that is not explicit."
 )