Copter: Ability to generate auto-mission from dataflash log, to reproduct manual flight

Idea is after manual flight with manual triggering of photos, is to generate from GUI auto-mission from dataflash log to reproduct this manual flight.

GUI will generate new mission including horizontal and vertical positioning, heading, gimbal pitch and cam trig points. first we can elaborate mission generator algorithm that generate points each X meters (for example from one to 100 meters resolution) and that take gimbal pitch position ant each point and each camera triggering point.

What you think?

Start by locating Mission Planner's GUI handling for dataflash logs and mission generation; the issue names no files or tests. Clarify how manual flight positions, headings, gimbal pitch, and camera-trigger points should be sampled before designing the algorithm. Done means the GUI can generate a reproducible auto-mission from a log at a selected point resolution.

Written by the indexing model from the issue text.