xF2 Eklenti Alert Improvements 2.13.0

• Require StandardLib v1.22.0+
• Fix bulk alert 'mark read' would fail if there was no unread alerts on the current page but the user had unread alerts
• Fix changing Unread alert icon/Recent alert icon did not trigger XF2.3 font-awesome icons to be consistently added
• Rework how alert read status icon is added to an alert
  • Add Just read alert icon style properties to style a just read alert icon and give it a tooltip phrase.
    • This icon is disabled by default for new installs. Upgrades will inherit Unread alert icon flag to enable this functionality per-style
  • Update various alert icons to match between XF2.2 and XF2.3, and rename icon style property names to be less confusing
    • "Unread" alert icon is now fas fa-star (solid star)
    • "Just toggled read" alert icon is now fas fa-star-exclamation (solid star with an exclamation in the middle)
    • "Recent read alert" icon is now far fa-star (hollow star)