1.9:
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 * Prepare for Serendipity Styx 4.4.0 - expandable hooked sidebar links

1.8:
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 * Improve and fix backend markup indents for Serendipity Styx 4.3.0

1.7:
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 * Fixes for linebreaks and PHP 8
 * Raised requirements
 * Removed Serendipity < 2 Series conditions

1.6:
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 * Iconfont accessibility fixes

1.5:
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 * Set Plugin consistencies
 * Use lang API - extends required version

1.4:
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 * Added additional backend markup for 2.0 backend (yellowled)