PHP 8.4 support

[dktapps]

• [x] account for ZEND_JMP_FRAMELESS
• [x] internal functions can now have doc comments
• [x] function literals may now have IS_UNDEF holes due to compile-time optimizations
• [ ] property hooks supported & fully tested
• [ ] asymmetric property visibility fully tested (though should just be a case of making sure flags are copied properly)

thanks to @AkmalFairuz for initial work, this PR is based on his work from #142

[dktapps]

Test failure looks to be caused by incorrect refcounts on string copies for zend_property_info, not sure how to address that just yet but my gawd is it ever irritating.

[TheColorDroid]

Is it ready to support php 8.4?

[dktapps]

No, it's not complete