keys.py - figure out customization of symbol_key and punctuation lists

[knausj85]

After merging #1555, we may want to sort out how to ease the customization of symbol_key and punctuation list

• Currently, symbol_key_words is imported by create_spoken_forms.py. We may want to re-evaluate whether we really utilize this functionality so we can move to .talon-list. Otherwise, gotta explore other options
• punctuation_words (used to populate the punctuation list) is a subset of symbol_key_words (used to populate the symbol_key list) that's intended to be available in both command and dictation. symbol_key_words is only used in command mode. It's unclear how we can cleanly port this to .talon-list files without duplication. Some options that come to mind...
  • Without the create_spoken_form dependency, we could simply update the existing symbol_key capture to utilize both lists, and port both to .talon-list
  • a CSV with a custom parser where we can somehow specify the intended scope.
  • simply split this out into its own python file for easier customization
  • insert other options here :)