Add a Lua binding to determine Ardour version

libs/ardour/luabindings.cc

@@ -84,6 +84,7 @@
 #include "ardour/region.h"
 #include "ardour/region_factory.h"
 #include "ardour/return.h"
+#include "ardour/revision.h"
 #include "ardour/route_group.h"
 #include "ardour/send.h"
 #include "ardour/session.h"
@@ -757,6 +758,8 @@ LuaBindings::common (lua_State* L)
 	luabridge::getGlobalNamespace (L)
 		.beginNamespace ("ARDOUR")
 
+		.addConst ("revision", ARDOUR::revision)
+
 		.beginClass <InterThreadInfo> ("InterThreadInfo")
 		.addVoidConstructor ()
 		.addData ("done", const_cast<bool InterThreadInfo::*>(&InterThreadInfo::done))