Improve eventghost plugin

Improved the EventGhost plugin to allow configuration and expose more functionality.

Summary:
* Updated lightpack.py to latest version (with modification to fix empty profile)
* Will now connect when plugin is started and disconnect when plugin is stopped (rather than connecting on plugin initialization and never disconnecting)
* Added plugin configuration options to allow user to set Prismatik host, port, and API key
* Added new actions: SetProfile, SetColor, SetColorToAll, SetSmooth, SetGamma
* Replaced LowBrightness and MaxBrightness actions with SetBrightness action
* Removed Toggle action
* Removed unnecessary debug printing
* Changed language to be more consistent throughout the plugin