add CsvReaderSettings

Preparation to add more complex CSV parsing rules.

pdb-api/src/main/java/org/lucares/pdb/api/UniqueStringIntegerPairs.java

@@ -119,6 +119,7 @@ public class UniqueStringIntegerPairs {
                 String line;
                 while ((line = reader.readLine()) != null) {
 
+                    // TODO use more efficient code to read the CSV -> improves startup time
                     final String[] tokens = line.split(Pattern.quote(SEPARATOR));
 
                     if (tokens.length == 2) {