Configurable Option to Delete Command Invocations

[jedi3r4]

Gearbot should be able to be configured to delete invocation message for custom, fun, admin, mod, emoji, infractions, and reminders, and depending on the commands, the Gearbot message should be deleted too after a few seconds.

[AEnterprise]

planned dashboard feature, as that will allow toggling it as well as setting a delay much more cleanly