[BUG] Path values assume a UNIX system

[Krytic]

Describe the bug In, for example, hoki/constants.py, L159:

path_to_settings = data_path+'/settings.yaml'

On a Windows system, this will fail as the directory separator is \ in Windows environments.

This should be replaced with something like (from the standard library os):

path_to_settings = os.path.join(data_path, 'settings.yaml')

which will apply the right directory separator for the right OS.

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Expected behavior n/a

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[Krytic]

Just to note, this issue isn't just limited to the constants module: it's everywhere Hoki needs to load files.