Added waypoint support to the plugin.

- The plugin now supports drawing a series of waypoints in the world.
 - The plugin supports add, remove, and clear operations
  - Add and remove take a list of waypoints
  - Clear removes all waypoints

xpcPlugin/xpcDrawing.h

@@ -1,8 +1,23 @@
 #ifndef xpcDrawing_h
 #define xpcDrawing_h
 
+#include <stdlib.h>
+
+typedef struct
+{
+	double lattitude;
+	double longitude;
+	double altitude;
+} Waypoint;
+
 void XPCClearMessage();
 
 void XPCSetMessage(int x, int y, char* msg);
 
+void XPCClearWaypoints();
+
+void XPCAddWaypoints(Waypoint points[], size_t numPoints);
+
+void XPCRemoveWaypoints(Waypoint points[], size_t numPoints);
+
 #endif