Debian 13 Build Support and PCRE2 Upgrade

[markjcrane]

Summary

This PR adds support for Debian 13 (Trixie) by upgrading FreeSWITCH to use PCRE2 library.

Changes

1. PCRE2 Upgrade - Debian 13 removed the old PCRE library, only PCRE2 is available

   • Upgrades regex handling throughout the codebase
   • ⚠️ Contains breaking changes for some regex patterns

2. Debian 13 Build Support - Adds "trixie" to supported distributions

   • Updates bootstrap.sh, control-modules, and util.sh

3. Bugfix - Fixes double-free in mod_dialplan_xml after PCRE2 upgrade

Commits Applied

• [Core] Upgrade FreeSWITCH to use PCRE2 library. Be aware of breaking changes.
• [Build-System] Add Debian 13 Trixie suite
• [mod_dialplan_xml] Fix double free after upgrade to pcre2. (#2946)

Original Commits

1. PCRE2 upgrade (foundational change)
   git cherry-pick 65bc7c1

2. Debian 13 build system support
   git cherry-pick dc3325f

3. Bugfix for the PCRE2 upgrade
   git cherry-pick 02549c1

Testing

Please test regex patterns in dialplans and configurations as PCRE2 has minor syntax differences from PCRE.

[markjcrane]

Remove merge conflict markers from switch_core.c#16 that were added by this pull request #14