Update branch with a new copy
[Library|Trunk]
Compliting Merging into trunk branch angular7 rev 55729
Add material/cdk to package.json
fix ngx-json-ld version in package.json to get 0.1.6 which is compatible to ang4
add schemajsonld annotaion in result landing pages | requires installation of ngx-json-ld
USe a json file to read properties | replace openaire Properties | parameterize menu (use params, community, ) | parameterize search pages (hide community information)
Clear some files | use new version of datatables for dataproviders tables
Fixing claim pages to be used as library cmponents - modules | use new version of datatables
Commiting first draft of openaire library for angular portals