Add c++ unit tests with docs; split out ./rpctest and ./cpptest from ./test

build.sh

@@ -7,11 +7,11 @@ set -eu -o pipefail
 
 # run correct build script for detected OS
 if [[ "$OSTYPE" == "linux-gnu"* ]]; then
-    ./util/build.sh --disable-tests $@
+    ./util/build.sh $@
 elif [[ "$OSTYPE" == "darwin"* ]]; then
-    ./util/build-mac.sh --disable-tests $@
+    ./util/build-mac.sh $@
 elif [[ "$OSTYPE" == "msys"* ]]; then
-    ./util/build-win.sh --disable-tests $@
+    ./util/build-win.sh $@
 #elif [[ "$OSTYPE" == "freebsd"* ]]; then
     # placeholder
 else