Sticky thread order 2.2.2

• Fix editing a thread could fail with an internal server error when removing the custom sticky thread ordering for a thread

• Minor code cleanup
• Remove excessive capitalization from 'Sticky thread order' label

• Require XenForo 2.2+
• Require php 7.2+
• Require StandardLib v1.20.0+
• XF2.3 support
• php 8.4+ compatibility fixes

• Requires XenForo 2.1+
• Requires php 7.0+
• Now depends on Standard Library by Xon
• Confirm XF2.2 support
• Micro-optimization, do not fetch sorting entity/row as it just needs to be used in order-by clause

This add-on appears to have no compatibility issues with XF2.1

• Update installer to be more robust when upgrading