[WIP] Generic stats mode (analyzes any reactions)

[marks]

Fulfills slackapi#13

Main changes

• Introduces an additional 'generic' type of channel analysis (in addition to to the existing 'triage' type) that can be chosen in the modal
  • In 'generic' analysis mode, all emoji reactions are reported on (not just those set in the config file for triage stats)
  • Triage analysis is the default in the modal and always used for scheduled jobs (which were formerly named 'reminders')
• Added threaded replies count and unique # of users who replied to each row (in both modes)

Additional changes to note

• Rename global shortcut from triage_stats to channel_stats
• Rename 'reminders' to more generic 'jobs'
• For now, all scheduled jobs will use stats type of 'triage' but that could change in the future
• Add .eslintrc command so VS Code auto fix works

Screenshots

Updated modal

Generic stats

Note: output is transposed (rows/columns swapped) to make it easier to fit into a single screenshot; some columns removed as well

Input (Slack channel)	Output (CSV, see note above)

Requirements (place an x in each [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.