User Activity by Xon 2.13.5

• Fix tracking users viewing threads in XF2.3

• Fix "user who are viewing X" showed up in places it wasn't configured to

• Update a number of addon options to use phrases
• Improve extendibility of the add-on
• Fix several XF2.3 issues

• Requires StandardLib v1.19.0+
• If installed, requires Redis Cache 2.17.0+
• XF2.3 compatibility update
• php 8.4 compatibility fix

• "Viewing users cut-off" option was ignored and default to 250

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