Ver 2.0.0

• upgrade dependencies (require java 21, bootstrap 5.3.3, etc.)
• add support for Matrix (se.alipsa.groovy.matrix) data
• add support for Matrix charts which (currently) requires java fx
• Remove the use of the SimpleTemplateEngine due to the size limitation
  as a consequence, scriptlet syntax is no longer supported
• Add Html class for convenient groovy -> html generation
• Change from flexmark to commonmark
• Change to active openhtmltopdf fork
• Use Matrix toHtml implementation to render tables instead of the OOTB GFM support
• Add support for command line invocation
• Add support for styled pdf by running the javascript in a javafx WebView