Calculation of change in aircraft takeoff distance and rate of climb based on Koch Chart

[Munzijoy]

Is your feature request related to a problem? Please describe.
Based on METAR information, an approximation of how how pressure altitude and temperature affect the increase of takeoff distance and decrease in rate of climb, could be automatically calculated. A so called Koch Chart can be used to estimate those values.

Describe the solution you'd like
Show the estimated increase of takeoff distance and decrease in rate of climb below METAR information.

For further information and a first suggestion on how this could look like, reference to this comment: Originally posted by @Munzijoy in #408 (comment)

[kebekus]

@Munzijoy Understood. As you probably saw, I am currently streamlining your code and refactoring the METAR class, which contails a lot of old code. I will come back to you as soon as I am finished.