RFR CODETOOLS-7902339: Handle different look and feels in JFileChooserOperator

[Muneer Kolarkunnu]

Hi All,

Please review fix for the enhancement: https://bugs.openjdk.java.net/browse/CODETOOLS-7902339 

Webrev : http://cr.openjdk.java.net/~akolarkunnu/7902339/webrev.00/ 

Description:
There are multiple issues in different L&Fs.  
In GTK and Motif L&F:  
There are two JLists, one is to list folders and second one one is to list files, but current JFileChooserOperator implementation didn't consider this, it expects only one JList that is to list files. 

Windows & Windows Classic L&F: 
There is no 'Go Home' button, but there is a toggle button to go desktop. In Windows platform 'Go Home' button usually(In metal and nimbus L&F) navigates to Desktop only.

Regards,
Muneer