Spinbox callbacks and the revisionator

[demonnic]

Adds

• Revisionator
  • used to manage running incremental patches for package upgrades
  • keeps track of the currenlty applied patch level using a file
  • only applies patches which are newer than the currently applied patch level any time :migrate() is run
  • :migrate() returns true if patches were applied, false if it was already at the latest patch level
• Demontools.echoConverter
  • will be incorporated into Mudlet via Add functions to convert one color echo string to another Mudlet/Mudlet#6849
• SpinBox
  • callBack
    • a function which will be called any time the spinbox's value is adjust.
    • called like mySpinBox.callBack(self.name, value, oldValue)
  • also raises an event with the same parameters. This allows for your choice of how to listen for changes.