Migrate `API` class

[BD103]

Last year's API class can be found here.

This year, we need it to support the following things:

• Access the current OpMode without passing the object into every function.
• Support running code when an OpMode is initialized.
• Support running code when an OpMode is stopped.
• Access LinearOpMode-specific functions, with possible fallbacks / errors if unavailable.
• Specify API dependencies.
• Reset variables so old configuration does not persist across runs.
  • If possible, this should be automated and invisible.