Automatic script update checks and install

[empus]

Features:

• Add the ability for the bot to periodically check for new script updates
• New update command to check, install, restore the last script backup, or list github branches

  update <check|install|restore|branches> [branch]

  • allow -f to force downloads
  • allow -t to test download & install without moving existing files

• create first-time use backup of the entire armour directory (safety net)
• compare new sample config with existing values, retaining existing where they differ

Handling where multiple Armour bots run from a common eggdrop install directory:

• automatically detect an installed update from another bot and apply it locally
• prevent one bot from downloading updates if another bot already has a download in progress

New configuration options:

• whether to periodically check for updates (hourly)
• whether to send notes to global 500 users when new updates are found
• whether to automatically install new updates (or require manual install via update command)
• what Github branch to check and apply updates from (default: master)
• age (in days) of old script backups to periodically delete (hourly)
• debug mode to download and stage updates but not apply them

[empus]

Still to do:

• Detect when another bot in same directory already applied an update -> merge config & apply