Release 2.3.2 - tested on PHP 8.2 and 8.3

• psalm version 5 is used for static analysis, fixed new-found issues
• JS generated by Length rule now checks whether an element's value itself is empty, not its length property
• Added missing getter methods for existing setters:
  • \HTML_QuickForm2_Element_Button::getContent()
  • \HTML_QuickForm2_Element_Static::getTagName()

2.3.0 - now with PHP 8.1 support

• The package runs under PHP 8.1 without E_DEPRECATED messages (see #6)
• Minimum required PHP version is now 5.6