Internal JavaScript values only

[WilliamRagstad]

Description:
This pull request addresses some of the following changes:

• Use JS-only values to improve consistent user experience
• Resolved a minor bug in the existing code
• Removed site manifest link
• Explicit public assets route
• Moved about
• Fixed variable creation in runtime isolate scope instead of temporary
• Implemented the rest of the route execution
• Removed init temporarily
• Handled potential errors
• Added execute route error
• Fixed warning and info formats
• Warned when failing to close threads
• Fix execute routes
• Fix webx_static
• Add ok_json response
• Use Bytes responses
• Ignore empty messages
• Fix server header and banner
• Improve banner and header handling
• Generic body
• Remove WXLiteralValue

This change has been tested locally and is ready to be reviewed.