[wpical] Refactor to use WPILib libraries, modern C++ conventions, and LGPL libraries

[Gold856]

wpical was unable to use wpimath and its dependent libraries because Ceres was compiled with a different version of Eigen. Now that the Ceres build has been redone, we can now use wpimath and our C++ apriltag wrapper in wpical, allowing for major refactors. This includes:

• Using to_json and from_json specializations to concisely serialize and deserialize all JSON files instead of manually handling JSON.
• Removal of the Fieldmap and Pose classes, which was were duplicates of the AprilTagFieldLayout and Pose3d classes respectively.
• Using AprilTagDetector instead of the raw libapriltag library.
• Using Pose3d instead of raw Eigen matrices.

In addition, several other refactors were made to make the code more readable and to fix several UX issues and crashes. This includes:

• Eagerly parsing every JSON file when selected by the user. This means JSON files are only parsed once on selection, instead of every time a downstream function wants to use the data. This also means invalid JSON can be detected upfront and a specific error shown immediately instead of a catch all error when trying to calibrate.
• Using std::optional to indicate a calibration failed instead of status codes.
• Breaking up the massive DisplayGui function into separate functions which contain code for different popups. This also allowed for better organization and scoping of static variables.
• Renaming variables to make their purpose more clear.
• Displaying the tags present in a field layout when trying to combine multiple field layouts.

Fixes #7722.

[Gold856]

This currently depends on wpilibsuite/thirdparty-ceres#10 being merged.