Tnz

This release has various bug fixes and enhancements. Most notable:
- enhancement to allow for separate tnz instances (73)
- fix windows paste/bracketed-paste (74) (75)
- pa1 for attention while keyboard locked (78)
- doc api reference (79) - e.g. https://ibm.github.io/tnz/ati
- entry_points select or get (84) - fix for Python 3.12

**Full Changelog**: https://github.com/IBM/tnz/compare/v0.3.6...v0.4.0

This release has various bug fixes and enhancements. Most notable:
- special `SESSION_PS_SIZE` value handling has been fixed
- `SESSION24` and `SESSION_*` environment variables will be used
- file transfer error handling has been improved
- the wiki content has been transferred to github pages
- OpenSSF Best Practices badge work has been started
- `tnz.readlines` for TSO has been made available
- MAXLOSTWARN checking has been fixed
- the `~/.ztirc` not found warning message has been suppressed
- the alternate code page identifier has been fixed
- hostname resolution has been fixed

Contributors:
najohnsn
ijmitch
KipTwitchell

Fix to not require `importlib.metadata` when using Python <3.8.

Fixed bug with split tn3270 records.