move standalone projects into own directory

projects/_standalone/pdf-salad/test.sh

@@ -0,0 +1,12 @@
+#! /bin/bash
+
+# Something is broken in the Node dependencies on Mac, so don't bother.
+if [ "$CI_OS_NAME" = "macos-latest" ]; then
+    exit 0
+fi
+
+if [ ! -z "$CI_OS_NAME" ]; then
+    npm install pdf-lib
+    haxelib install hxnodejs
+fi
+haxe build.hxml