Definition of new Xtrack-compatible beam elements

• Introduction
• Definition and management of the data structure
  • Allocation of beam elements on CPU or GPU
  • Python access to beam-element data
  • Underlying xobject
  • Custom __init__ method
• Definition of the tracking function
  • Accessing beam-element data from C
  • Writing the tracking code
• Data recording in beam elements
  • Introduction
  • Recording of an individual table
  • Recording of multiple tables
  • Internal record for elements used in standalone mode
• Lost particles state codes