Add Managers

[Foxtrek64]

closes #46

• Add managers to locks
• Add manager commands
• Create action for adding/removing managers.
• Modify trust action to allow managers to add/remove trusts
• Treat managers as trusted on
  • Key Locks
  • Private Locks
• Update Documentation
• Add Phrases
  • text.htm.untrust_manager
  • text.htm.error.manager_not_trusted
  • text.htm.trust_manager
  • text.htm.error.manager_already_trusted
  • text.htm.managers
• Revert changes to build.grade and settings.gradle (not sure why Kotlin support was added)
• Update InfoAction to display managers
• Add tests There is no testing library it seems, so this step is skipped