Add dependent submodules

I'm using my SMJansson library wrapper.  Will have to get the native include in addition, though.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "scripting/include/newdecl-handles"]
+	path = scripting/include/newdecl-handles
+	url = https://github.com/nosoop/newdecl-handles

scripting/include/newdecl-handles

@@ -0,0 +1 @@
+Subproject commit 7b3e039f6dc143704da8b76461e93a873b4a98ec