ParseOptions: Add ParseOptions::allocation_limit

[Serial-ATA]

What this changes:

• Adds ParseOptions::allocation_limit
• Changes the default allocation limit to 16MB (previously 8MB)
• Makes Probe::set_file_type() return Probe to support using it in a builder pattern
  • This was done to make the test nicer, and should've been the behavior from the start.
• Improves the message for ErrorKind::TooMuchData
  • Might be worth adding a new variant specifically for exceeded allocation limits in the future. The other contexts where it is used don't necessarily apply to allocation.

The allocation limit can simply be set once and retained for the rest of the program's runtime.

closes #274
closes #208