Fixed bug AUT-1565 - Cannot ingest data when you create a case with Japa...

...nese characters

Slethkit code makes calls to JNIEnv->GetStringUTFChars() to convert folder name. Java uses UTF8 and returns strings as such. Windows uses UTF16 so we needed to convert UTF8 to UTF16. (I believe) For Linux we do not need to do this so there is a "#ifdef TSK_WIN32". This needs to be tested on a Linux machine.

I have tested it on Windows and was able to create a case with japanaese characters and ingest data from small2.img