PList settings to control behaviour

[abemedia]

It would be great if a few details could be controlled by settings in the application's plist. Here are my suggestions:

• LMForceMove (bool): Defaults to false. If set to true it disables the options "Do Not Move" and "Do not show this message again" and has a "Cancel" button in place of "Do Not Move" which closes the application.
• LMUserDirectory (string: auto | always | never): Defaults to auto.
  • auto: current behaviour.
  • never: will always install to /Applications.
  • always: will always install to ~/Applications (providing this exists).

For LMUserDirectory another option might be a simple boolean which disables the user directory and forces install to /Applications. This would suffice for my use-case.

Would you be willing to accept a PR with the above? I have a requirement for them and rather than create a fork it would be awesome if others could also benefit from this.