1.5.3.1 (Debian 12 & Ubuntu 23 fix)

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Changelog 1.5.3 to 1.5.3.1

Added support for Debian 12 and Ubuntu 23.x
Many significant structural changes to allow more flexibiltiy as distros change further in future.
Much re-working of main installer script to bring all the configure options as close together to the top of the script
Added 3 tier achitecture build support (script for a standalone backend MySQL build (and future upgrade) plus a changed main installer to fully support a backend SQL install option)
Added a custom theming template and theme instructions how to.
Added a dark mode branding template
Added the quick connect extension to the installer
Added the history recorded storage extension to the installer
Added a Tomcat root url redirect to /guacmole from the root gucamole site instead of wholesale removal of the root site (its removal breaks the source install process of the version label file, which breaks the upgrader's awareness of the current verion, which breaks ongoing upgrades!)
Added a MySQL/j connector upgrade option to the upgrade-guac script
Added a new re-runnable script to refresh TLS certs
Made the nginx tls installer re-runnable for the abilty to change IP and proxy name by re-running this script
TLS scripts are now saved to a new directory each time a refresh or name change script action is run so older certs are not overwritten
Many extra actions to syncronise the scripts with setting from install, makihg the add-on scripts much more portable for standalone use away from the main installer script.
Many code format tidy ups and improved descriptions in code comments.