Integration of property based testing into Bitcoin Core

update copyright headers

attempt to fix linting errors

Fixing issue with make check classifying generator files as actual unit tests

Wrapping gen files in ENABLE_PROPERTY_TESTS macro

Make macro better

configure.ac

@@ -130,6 +130,12 @@ AC_ARG_ENABLE(gui-tests,
     [use_gui_tests=$enableval],
     [use_gui_tests=$use_tests])
 
+AC_ARG_WITH([rapidcheck],
+  [AS_HELP_STRING([--with-rapidcheck],
+  [enable RapidCheck property based tests (default is yes if librapidcheck is found)])],
+  [use_rapidcheck=$withval],
+  [use_rapidcheck=auto])
+
 AC_ARG_ENABLE(bench,
     AS_HELP_STRING([--disable-bench],[do not compile benchmarks (default is to compile)]),
     [use_bench=$enableval],
@@ -1134,6 +1140,22 @@ AC_CHECK_DECLS([EVP_MD_CTX_new],,,[AC_INCLUDES_DEFAULT
 ])
 CXXFLAGS="${save_CXXFLAGS}"
 
+dnl RapidCheck Property Based Testing
+
+enable_property_tests=no
+if test "x$use_rapidcheck" = xauto; then
+    AC_CHECK_HEADERS([rapidcheck.h], [enable_property_tests=yes])
+elif test "x$use_rapidcheck" != xno; then
+    enable_property_tests=yes
+fi
+
+RAPIDCHECK_LIBS=
+if test "x$enable_property_tests" = xyes; then
+   RAPIDCHECK_LIBS=-lrapidcheck
+fi
+AC_SUBST(RAPIDCHECK_LIBS)
+AM_CONDITIONAL([ENABLE_PROPERTY_TESTS], [test x$enable_property_tests = xyes])
+
 dnl univalue check
 
 need_bundled_univalue=yes