v2.7.2 released - more buffer fixes and documentation updates

[Kyle]

Version 2.7.2 was released with more buffer fixes for vulnerabilities found by @akoul and @dloucks01. Thank you!

The documentation was also updated:

- add a new wiki page for example tag strings.

- clarify the use of plc_tag_lock()/plc_tag_unlock().  Especially within callbacks.

- document the use of the connection_group_id attribute.

The sudden increase in various buffer issues is likely due to increased AI scanning of the code base.  So far this has not been too much of a flood of bug reports.  Regardless of the source, I take these seriously!

The release can be found here.

Best,

Kyle