feat: Jobs/Tasks + Moderation Overhaul

[sustained]

PR

• Rename jobs to tasks
• Add services/tasks - Persist task options/configuration
  • If the DB is empty, create it based on the defaults in the task classes
  • If a new task is created, add it to the DB
• Add !error command, necessary for testing tasks/log
• Refactor ban-words service to moderation service - supports various different actions
• Add commands for managing moderation triggers
  • !add-trigger <action=warn|kick|ban|notify> <trigger> - Add a trigger word/phrase
  • !remove-trigger <trigger> - Remove a trigger word/phrase
  • !list-triggers - List all triggers
• Update/improve commands for managing tasks
  • !enable-task <task-name> - Enable a task
  • !disable-task <task-name> - Disable a task
  • !task-info <task-name> - Show in-depth information about a task
  • !list-tasks - Show all tasks and their status (enabled/disabled)
  • !reset-tasks - Reset all tasks to their default configurations
• Improve tasks
  • LogTask
    • Logs various events (command errors, unknown commands, successful invocations etc.)
    • All is configurable (which things should be logged and where)
  • BanTask -> ModerationTask
    • Refactor to ModerationTask - now supports kicks, bans, warns & notifications
• Add Task argument type
• General refactoring
  • Various improvements (inc. comments) to task- and moderation-related files
  • Several iterations of misc. code clean up (DRY etc.)

Miscellaneous

I need to stop doing miscellaneous changes in random PRs, I know. But if I see an issue my immediate instinct is just to fix it there and then. 😦

• Fix NODE_ENV issue.
• Fix development-only commands in production.
• Fix some unnecessary duplication in constants files.
• Fix a small issue with trySend message util.

[sustained]

Typo here.