Fetch sys_language_uid from database.
Until now we did not fetch system related fields from database. As there
is now a RemoveProcessor, integrators are able to remove fields.
Also providing this field enables basic multi language support.
Relates: #25
Search results are now processed through data processing by search
service. The result will be a SearchResult model from our domain. Also
SearchResult will execute new queries, e.g. from paginate widget,
through SearchService to apply data processing again.
Remove duplicate stub code to trait, to keep own logic and code clean.
Before data processing was applied for TCA only, through tca table
service.
Now it's applied much later in process and in abstract indexer.
Therefore all indexer will run data processing if configured.
Ad TYPO3 Core now makes use of Doctrine, a connection is required to
build system where. Therefore we move it to an own method to exchange
the execution inside of tests.