Fix sorting of Groups with file lists, radio buttons in Groups

[jamiechong]

I had some issues with a repeatable and sortable group that contained a radio_inline field and a file_list field.

The radio button issues were documented in #150 and #152.

There were a few bugs when trying to sort a group that had a file_list. #187

1. There was a javascript error in the loop of $goto.find( cmb.repeatEls ).each( function( index ) if the number of images in the two file_lists being swapped differed. This was because the index id was based off the number of input elements, which are hidden for file_lists. I fixed this on line 26 repeatEls : 'input:not([type="button"],[id^=filelist]),select,textarea,.cmb2-media-status',
2. The attribute names of the file_list hidden input fields that set the image id didn't correspond with the correct row number. This is fixed in line 629 to 645

[jamiechong]

I'm not sure what the "Failed" check is, but this pull request is legit. It's the same PR as #153 but you wanted me to apply changes to trunk. Hopefully you can get this into a near-future release! At least look at the changes - maybe you want to implement the fixes in another way. Thanks!

[jamiechong]

trashing this PR.