For keyboards installed via keyboard packages, use the welcome.htm if it exists for keyboard information
- Update PackageProcessorTest to include CustomHelpLink info
- Renamed Welcome.htm to welcome.htm in test_resources/**/gff_amh_7_test_json.kmp.
- Modify kmp.json to have package versions 1.4 and 1.5.
- also made exception string more descriptive when JSON object doesn't contain a valid "options" object