Update python handling and tests

[MadniAbdulWahab]

Fixes #649.

Summary

• Created test functions for pspm_check_python and pspm_check_python_modules.

New files

• src/py_find_location.py
  • This python file can detect the location of python source in the system.
• pspm_check_python.m
  • The file can check if python environment has been set up in the system.
• test/pspm_check_python
  • The test function can automatically detect python in any system by using pspm_find_python. No user specification is required. However, it needs that Python has been installed in the system.
• test/pspm_check_python_modules_test
  • Due to complexity, I disabled the checking of "no module". The Python library in the GitHub environment seems to have got some packages, and it is tricky to remove them first.
• src/pspm_find_python.m
  • This is a new file that can detect python package in the system with two modes
  • Mode 1: automatically load from system. This mode only relies on src/py_find_location.py and do not require users to specify first.
  • Mode 2: it load python from a specific path. If users have previously defined python path (in this case the path will be saved as py_loc.txt), the function can use this saved text file to load python.
  • This function has been updated to support both windows and unix.

Minor changes

• main.yml (Github actions)
  • Python environment was set up by updating the main.yml file.
• .gitignore
  • The Python location file has been ignored.
• src/pspm_cfg/pspm_cfg_python.m
  • The description of Python environment has been adjusted. Users do not need to specify Python before they can use the auto detection feature. The python detection code is done with Python's own script and does not need users to specify first.
• src/pspm_cfg/pspm_cfg_run_pp_heart_data.m
  • Now the auto mode can detect python correctly.

[teddychao]

I am not sure I understand what test functions want to test, such as whether it wants to test if they are able to detect the python packages or what platforms they want to test.

[teddychao]

Updated UI Now users will have to specify the path of python before run heart data pre-processing with heartPy