Refactor font patcher

[haasosaurus]

Description

put most code in functions
broke some functions into multiple functions
put most functions in a class
put 2 blank lines between all functions
renamed some variables/parameters for to make their purposes more clear
renamed some functions to make their purposes more clear
aligned some groups of lists, dicts, etc elements for better readability
changed some lists and dicts to put their elements on separate lines
changed conditions var == False to var is False
removed extra commas in lists and dicts
removed whitespace in brackets, braces, etc that touches the brackets, braces, etc
added whitespace after commas in lists and dicts
added whitespace around operators
changed FIXME and TODO to uppercase
added 4 NOTEs in regards to questions i had
changed unneeded returned variables to underscores
changed some update_progress block comments to a docstring
added some docstrings

Requirements / Checklist

• Read the Contributing Guidelines
• Read or at least glanced at the FAQ
• Read or at least glanced at the Wiki
• Scripts execute without error (if necessary):
  • If any of the scripts were modified they have been tested and execute without error, e.g.:
    • ./font-patcher Inconsolata.otf --fontawesome --octicons --pomicons
    • ./gotta-patch-em-all-font-patcher\!.sh Hermit
• Extended the README and documentation if necessary, e.g. You added a new font please update the table

What does this Pull Request (PR) do?

refactors font-patcher

How should this be manually tested?

patch any or all fonts with any options

Any background context you can provide?

What are the relevant tickets (if any)?

none

Screenshots (if appropriate or helpful)

[ryanoasis]

Just want to let you know again this is very appreciated and I am sorry I haven't been able to get to reviewing it yet, also this is probably going to get into the 2.2.0 release not the 2.1.0, thanks for understanding!

[ryanoasis]

Whoops I didn't mean to close and comment, just comment 😅