[sources management] nicer source management view and breadcrumbs (closes #1946329)
* nice 'add host config button'
* table displaying host configuration
* display a source's config using <pre> or something like that that respects EOL
* configure breadcrumbs for CWSourceSchemaConfig and CWSourceHostConfig
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile