Some more fixes for the Python module type hinting.

[bcoconni]

Fixes a few errors that were remaining after the PR #1393.

• The stub file is renamed from _jsbsim.pyi to __init__.pyi so that it applies correctly to the module jsbsim instead of currently jsbsim._jsbsim.
• Also fixes a pair of type hintings where the transition from SGPropertyNode to FGPropertyNode (see PR Remove the class FGPropertyNode #1270) has been overlooked.
• Remove the useless statement from . import _jsbsim.

EDIT: see also #1415 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.11%. Comparing base (1b9c981) to head (181950f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1415   +/-   ##
=======================================
  Coverage   25.11%   25.11%           
=======================================
  Files         169      169           
  Lines       18720    18720           
=======================================
  Hits         4702     4702           
  Misses      14018    14018           

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[agodemar]

OK to merge!

[bcoconni]

I have updated the PR with the following:

• Added the class DefaultLogger and the function set_logger to __init__.py
• Functions and methods with a name starting by a single underscore are excluded from the module type hinting.
• The function inherit_docstring has been renamed _inherit_docstring_from_super_class for clarity and to be excluded from the module type hinting since it is for internal use only.
• Added some documentation to the C++ class FGLogger and the functions SetLogger and GetLogger.

@agodemar, @seanmcleod70 let me know if that is still OK with you to merge.

[agodemar]

@bcoconni green light from my side

[seanmcleod70]

Looks good to me.

[bcoconni]

Thanks. The PR is merged.