fix docx generation
json schema

* uri fix
bugfix

* correct public wiki url handling
* check availability of dev guide
schema adjustment

* relax uri type
* fix wiki references
schema adjustment

* relax wiki media references
update list of SEs in release
catalog update

* enable cmd line regeneration of a set of SEs
* wiki references for json schema
* Not applicable for license feature (Required)
* wiki reference resolution for SE spec
* fileurl() added to wiki
catalog thumbnail

* cmd line tool to generate the thumbnails added
catalog generation

* SE appearance (bgcolor) added
* new version of catalog template
* youtube pitch id extraction
* timestamp of generation
* thumbnail generation added
* fixed vertical alignment issue
* refactoring
catalog generation

* revert debug changes
* stricter json schema validation to harmonize input data
* cleanup