Added only takeoff segments and polar.

[esnguyenvan]

This is a separate pull request to include only dedicated takeoff segments and polar modifier. The changes to mission builder will be added separately.

[codecov[bot]]

Codecov Report

Merging #481 (fb246ad) into master (6aa9de5) will increase coverage by 0.27%. The diff coverage is 92.18%.

@@            Coverage Diff             @@
##           master     #481      +/-   ##
==========================================
+ Coverage   83.42%   83.70%   +0.27%     
==========================================
  Files         122      126       +4     
  Lines        5520     5706     +186     
  Branches      837      853      +16     
==========================================
+ Hits         4605     4776     +171     
- Misses        766      776      +10     
- Partials      149      154       +5     

Impacted Files	Coverage Δ
...rformances/mission/segments/ground_speed_change.py	70.00% <70.00%> (ø)
src/fastoad/models/performances/mission/polar.py	94.11% <88.88%> (-5.89%)	:arrow_down:
...d/models/performances/mission/segments/rotation.py	90.90% <90.90%> (ø)
...stoad/models/performances/mission/segments/base.py	90.67% <94.87%> (+0.62%)	:arrow_up:
...ls/performances/mission/segments/end_of_takeoff.py	96.22% <96.22%> (ø)
src/fastoad/model_base/flight_point.py	93.18% <100.00%> (+0.24%)	:arrow_up:
...toad/models/performances/mission/polar_modifier.py	100.00% <100.00%> (ø)

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[esnguyenvan]

Hello, Thanks for the comments, I tried to address everything and proposed some additional changes in the last commit. Please let me know if I forgot something or if new changes have to be corrected

[esnguyenvan]

Now it should be fixed with rebase from master