define the waypoint with PTA

BaseTypes.proto

@@ -6,6 +6,11 @@ message Coordinate {
     double longitude = 2; // WGS84 longitude in degrees
 }
 
+message Waypoint {
+    string name = 1; // The waypoint's name
+    string pta  = 2; // The planned time of arrival (YYYY-MM-DD HH:MM:SS)
+}
+
 message Dynamics {
     int32 groundSpeed   = 1; // given in knots
     int32 altitude      = 2; // given in feet