[Simple Inquiry] Cut a Log segment and save as a new Log file

#### Issue details
Hi, I am just wondering about editing a Log file.

We can upload and analyze our Log file on [Mission Planner] --> [DATA] --> [DataFlash Logs] --> [Review a Log]. Thanks a lot for this wonderful features. 😄

On Mission Planner, are there any existing features as like:
**could we cut a Log segment (based on the timestamps) and save it as a new (smaller) Log file?**

#### Version
Mission Planner 1.3.72

#### Platform
[ ] All
[ ] AntennaTracker
[O] Copter
[ ] Plane
[ ] Rover
[ ] Sub

#### Airframe type
Quadcopter

#### Hardware type
Pixhawk

Start in Mission Planner through DATA > DataFlash Logs > Review a Log, where log analysis is exposed. Determine how a user could select start and end timestamps and save the selected segment as a smaller Log file. Done means the exported file opens successfully for review and contains only the requested interval.

Written by the indexing model from the issue text.