Initial support for modules, partially implements #1

ph7int.h

@@ -15,6 +15,7 @@
 #define __PH7INT_H__
 #define PH7_PRIVATE
 #include "ph7.h"
+#include <dlfcn.h>
 #ifndef PH7_PI
 	/* Value of PI */
 	#define PH7_PI 3.1415926535898
@@ -1273,6 +1274,7 @@ struct ph7_vm {
 	SyBlob sConsumer;           /* Default VM consumer [i.e Redirect all VM output to this blob] */
 	SyBlob sWorker;             /* General purpose working buffer */
 	SyBlob sArgv;               /* $argv[] collector [refer to the [getopt()] implementation for more information] */
+	SySet aModules;             /* Set of loaded modules */
 	SySet aFiles;               /* Stack of processed files */
 	SySet aPaths;               /* Set of import paths */
 	SySet aIncluded;            /* Set of included files */