Overhauled data.py + Integrated new functions into api.py

[EpicAMC]

Added Functions:

• parse_courses_by_all_geneds: Returns DataFrame of courses matching ALL geneds given in a list of strings.
• parse_courses_by_geneds: Returns DataFrame of courses matching AT LEAST ONE gened given in a list of strings.
• parse_courses_by_departments: Returns DataFrame of courses from all of the departments given in a list of strings.
• parse_courses_by_primary_instructor: Returns DataFrame of courses whose primary instructor name includes the words (separated by spaces) in a given string.
• parse_courses_by_gpa: Returns DataFrame of courses whose gpa falls within the range of float values min and max
• parse_courses_by_course_number: Returns DataFrame of courses whose course number matches the given integer
• parse_courses_by_course_name: Returns DataFrame of courses whose course name includes the words (separated by spaces) in a given string.
• parse_courses_by_course_levels: Returns DataFrame of courses whose course level is within the range of int values min and max expressed in the hundreds (e.g. min = 100, max = 700)
• parse_courses_by_class_sizes: Returns DataFrame of courses whose class size is within the range of int values min and max
• parse_courses_by_criteria_dictionary: Returns DataFrame of courses that match all the criteria given in a criteria dictionary that has some level of leniency with key names and some level of resiliency against incompatible data and where criteria that are not sorted by can be omitted from the dictionary. Example testing code is given near the bottom of the file in a multi-line comment right above the previous deprected/messy function.

I tried to make the code readable, but I'm still a beginner at python and also don't have too much experience in general with the concept of "higher level" readability ¯_(ツ)_/¯

[EpicAMC]

Also, I tried my best testing everything along the way, (e.g. tested each function right after I wrote it to make sure its not dumpster fire) but some inputs will probably still cause problems. There's also probably some bad things I did in coding terms that I'm just not conscious of.

[EpicAMC]

Update: Integrated new functions into api.py and also updated existing routes to use the improved parsing functions