First attempt at using DOMPDF project as dependency.
Removed vendor directory as DOMPDF is no longer part of this package. It is a dependency.
Fixed dependency.
Fixed Composer version number for DOMPDFModule.
Attempting to fix DOMPDF path.
Fixing include path, again.
Fixing config paths.
Fixed paths (finally) to dompdf and font dir.
Removed require_once calls that are now taken care of by Composer.
Fixed undefined constants. These were not added to available config because they are used for DOMPDF web interface, which is not supported by DOMPDFModule.