10.1.0: I/O exceptions

• Made library compatible with XP 11, all PHP versions from 8.3 up to 8.6
  (@thekid)
• Merged PR #3: Refactor I/O exceptions, dropping XP 10 support in the
  doing. See xp-framework/core#363 for a write-up on the reason behind
  this and the plan to move forward.
  (@thekid)