WIP add uint16 (word) string list to example/test

[karlnapf]

Tests in/outgoing typemaps for non-char SGStringList

• C++
• Python
• Octave. Fixed bug! outgoing typemap results in vector of doubles where only first int is stored. Reason is since the code was copy pasted from char, but apparently never tested. Never has worked. Also found this lovely comment /* all (strings) must have same length in octave */. The new outgoing typemap now returns a cell array of row vectors for non-char types and a cell array of strings for char. Compatible with ingoing typemap
• C#. Only added correct type to example generator
• Java. Fixed crashes. We had

154: Exception in thread "main" java.lang.ArrayStoreException
154: 	at org.shogun.shogunJNI.SGObject_get_word_string_list(Native Method)
154: 	at org.shogun.SGObject.get_word_string_list(SGObject.java:355)
154: 	at string.main(string.java:32)

from the line
32 int[][] word_list = f_word.get_word_string_list("string_list"); which was caused by using the wrong JNI array type in int[][], namely [[I] instead of [I. Also generally cleaned up the method and fixed a memory leak that was introduced in #4423