Revamping get_input_path()

[axiomcura]

After successfully implementing helper functions that generate input and output paths in order to circumvent snakemake's strict pathing rules, there still happens to be a series of challenges that have not been solved yet.

Below are the documented issues associated:

• CytoSnake modules fails when using multiple inputs and generating one output due to get_data_path() #85
• Revamping get_input_path()  #86
• Establishing config standards for class methods #82