Add-ons Alert Improvements by Xon 2.14.4

• Fix conversation message reactions summarization had a bad link to the conversation message
• Attempt to reduce transaction size when rebuilding alert totals

• Require StandardLib v1.23.0+
• Add XF2.3 style variations support for various color style properties

• Fix unsummarizing a summary alert would cause an internal server error if a rare deadlock occurred
• Fix possible deadlock interrupting the process which expires too-old alerts