Altitude Angel updates May 2022

[rupertbenbrook]

Updates to the Altitude Angel extensions in Mission Planner. This includes:

• Moved all Altitude Angel code to use the plugin model and isolated all Altitude Angel changes to outside the main Mission Planner project, and in just two libraries. This should simplify code merging for future updates.
• Fixed a bug in enabling/disabling the Altitude Angel plugin by users. Now users are asked once if they want Altitude Angel data or not, and will not be asked again unless they explicitly click on an Altitude Angel plugin UI item (currently only right click on data and plan maps and selecting "Altitude Angel Settings"). If users ask for Altitude Angel data, an existing login will be used to log into the service, or login will be requested if this login has expired.
• Fixed a bug in the initial map data overlay settings for new users enabling upper airspace display, which is not often needed.
• Moved many English strings to resources so they can be localized in the future.
• Removed existing non-English translation of Altitude Angel text string as they we incorrect.
• Ensured the Altitude Angel Settings window and Login windows are presented centred to the main Mission Planner window when they appear. If this is not done they can appear on different monitors and it can be confusing.
• ServiceLocator now configures by looking for configuration classes in assemblies, allowing configuration to be split up more logically in the future.