Added new clip method that returns all properties for a given frame in JSON.

include/Clip.h

@@ -102,6 +102,9 @@ namespace openshot {
 		/// Adjust frame number minimum value
 		int adjust_frame_number_minimum(int frame_number);
 
+		/// Generate JSON for a property
+		Json::Value add_property_json(string name, float value, string type, string memo, bool contains_point, float min_value, float max_value, bool readonly);
+
 		/// Get file extension
 		string get_file_extension(string path);
 
@@ -159,6 +162,9 @@ namespace openshot {
 		Json::Value JsonValue(); ///< Generate Json::JsonValue for this object
 		void SetJsonValue(Json::Value root); ///< Load Json::JsonValue into this object
 
+		/// Get all properties for a specific frame
+		string PropertiesJSON(int requested_frame);
+
 		/// Waveform property
 		bool Waveform() { return waveform; } ///< Get the waveform property of this clip
 		void Waveform(bool value) { waveform = value; } ///< Set the waveform property of this clip

include/KeyFrame.h

@@ -107,6 +107,9 @@ namespace openshot {
 		/// Add a new point on the key-frame, with a specific interpolation type
 		void AddPoint(float x, float y, InterpolationType interpolate);
 
+		/// Does this keyframe contain a specific point
+		bool Contains(Point p);
+
 		/// Set the handles, used for smooth curves.  The handles are based on the surrounding points.
 		void SetHandles(Point current);