SDK v17.0.0

Breaking changes

• __from_ascii now returns an int, and its write callback does as well. This allows it to forward an EOF error code from its internal write function and exit early.
• fpos_t is now 32-bit for compatibility with cc65. If you need files larger than 2GiB, you probably don't want a 6502.

New features

• stdio is now feature-complete (parity w/ cc65) for commodore family targets
  • Text mode now converts at runtime from the execution character set (always ASCII) to the platform character set (PETSCII on non-cx16 systems).

Other changes

• The minimal stdio's FILE pointers are now non-null and all different.
• The simple ungetc was moved into the minimal stdio and the minimal getchar altered accordingly.