Resolves #343 GUI and Frame Refactor

Major rewrite of the GUI into a module and view form, also using a new Feed class. The frame and frameset data structures have also been rewritten to support memory pooling and response frames.

applications/gui2/src/modules/calibration/calibration.cpp

@@ -41,6 +41,7 @@ int OpenCVCalibrateFlags::defaultFlags() const { return (
 std::vector<int> OpenCVCalibrateFlags::list() const {
 	return {
 		cv::CALIB_USE_INTRINSIC_GUESS,
+		cv::CALIB_FIX_FOCAL_LENGTH,
 		cv::CALIB_FIX_PRINCIPAL_POINT,
 		cv::CALIB_FIX_ASPECT_RATIO,
 		cv::CALIB_ZERO_TANGENT_DIST,
@@ -64,6 +65,9 @@ std::string OpenCVCalibrateFlags::name(int i) const {
 		case CALIB_FIX_INTRINSIC:
 			return "CALIB_FIX_INTRINSIC";
 
+		case CALIB_FIX_FOCAL_LENGTH:
+			return "CALIB_FIX_FOCAL_LENGTH";
+
 		case CALIB_USE_INTRINSIC_GUESS:
 			return "CALIB_USE_INTRINSIC_GUESS";
 
@@ -123,8 +127,11 @@ std::string OpenCVCalibrateFlags::explain(int i) const {
 	using namespace cv;
 	switch(i) {
 		case CALIB_FIX_INTRINSIC:
-			return "";
-			
+			return "Fix all intrinsic paramters.";
+
+		case CALIB_FIX_FOCAL_LENGTH:
+			return "Fix focal length (fx and fy).";
+
 		case CALIB_USE_INTRINSIC_GUESS:
 			return "Use valid initial values of fx, fy, cx, cy that are "
 					"optimized further. Otherwise, (cx, cy) is initially set "