[c-host] initial agnostic option api and parser

c-host/include/interface/capture.h

@@ -74,6 +74,8 @@ CapturePointer;
 typedef struct CaptureInterface
 {
   const char *  (*getName        )();
+  void          (*initOptions    )();
+
   bool          (*create         )();
   bool          (*init           )(void * pointerShape, const unsigned int pointerSize);
   void          (*stop           )();

c-host/include/interface/platform.h

@@ -22,6 +22,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <stdbool.h>
 
 int  app_main(int argc, char * argv[]);
+bool app_init();
 void app_quit();
 
 // these must be implemented for each OS