jsPanel v4.16.0

• added Dialog extension. This extension adds an easy-to-use interface for dialog elements to virtually any jsPanel. It also offers a modal() function to create modal dialogs as well as alert(), confirm() and prompt() functions. jsPanel.dialog is a Third Party Extension developed and maintained by Michael Daumling.
• added The object used to set a custom theme with option.theme now accepts the properties bgFooter, colorFooter and borderRadius as well
• added method jsPanel.getCssVariableValue() to process css variables in options theme, border, borderRadius and methods .setTheme(), .setBorder(), setBorderRadius()
• updated internal methods .getThemeDetails(), .applyCustomTheme() and .pOborder() to support the use of css variables in option.theme, option.border, option.borderRadius and the methods .setTheme(), .setBorder(), setBorderRadius()
• reorganized code in the whole script