Allow user selected Image save folder about dionysus HOT 3 CLOSED

GitMate.io thinks possibly related issues are #84 (Make chart images save in correct folder.), #67 (Make avatar images save in correct folder. ), #17 (Logic for image generation), and #33 (Take avatar images and process them).

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Remove app_data/image_data folder since it will not be used.

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Complete: Issue appeared with JSON:

Initial test failed on mirrored convert_to_json data:

json_data_to_convert = '{\n    "1": "a",\n    "b": 2,\n    "3": "c",\n    "d": 4\n}'
converted_json_data = {1: 'a', 'b': 2, 3: 'c', 'd': 4}

This is because JSON does not have integer dict keys, so it converts the
integer keys to strings. When loading from JSON, json.loads does not
differentiate between dict keys of stings containing integers and
keys of integers converted to strings when converted to JSON.
Thus the test data was modified to expect strings in test of integers
as dict keys: {"1": 'a', 'b': 2, "3": 'c', 'd': 4}.

So test runs as:

json_data_to_convert = '{\n    "1": "a",\n    "b": 2,\n    "3": "c",\n    "d": 4\n}'
converted_json_data = {"1": 'a', 'b': 2, "3": 'c', 'd': 4}

assert load_from_json(json_data_to_convert) == converted_json_data

Added notes to file_functions.py functions convert_to_json,
load_from_json, in create_chart.py to write_chart_data_to_file, and in
class_functions.py to write_classlist_to_file describing this behaviour,
as it will be an issue if and when chart_data_files are reloaded, since
the keys in score-avatar_dicts are float values which are converted to
strings when converted to JSON, and this will need to be handled.

Handling will probably be as simple as
original_score_avatar_dict = {float(score): avatar_list for score, avatar_list in dejsonified_score_avatar_dict.items()}

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