WebUI v2.0.6

• Supporting href link
• Python serve a folder example
• Fix bug in Infinite loop when set_timeout() get called later
• webui.js won't close the window if href link clicked
• Fix bug in webui.js that show an error message when switching between window fast
• Fix window can't close after link-click
• WebUI-JS-Bridge logs are not enabled when building the lib in debug mode
• Fix missing Math lib in some Linux distro