file drop support

- Add a folder where you can drop Zip files which will then be
  extracted on the fly and ingsted.
- CsvReaderSettings now contain TagMatcher that are applied to the
  first line and can be used to extract additional tags.
- Update to jdk 16 so that we can have records.

pdb-ui/src/main/resources/application.properties

@@ -3,6 +3,8 @@ db.base=${base.dir}/db
 
 path.tmp=${base.dir}/tmp
 path.output=${base.dir}/out
+path.fileDrop=${base.dir}/drop
+path.fileDropConfig=${base.dir}/drop.json
 
 logging.config=classpath:log4j2.xml