Added the PDS file to extract the HTML Help files using PasDoc
Added more XML documentation
Fixed some XML errors.
Removed the license copy from the pas units.
Updated the LICENSE.md file
Added X11 error handling functions to FMXExternalPumpBrowser2 demo for Linux.
Deleted FMXExternalPumpBrowser demo for Linux.
Added uCEFMacOSConstants and uCEFMacOSFunctions units for MacOS.
Replaced TThread.Queue for TThread.ForceQueue to avoid executing that method immediately in some cases.