Add possibility of iterating over folders when the user is exporting issues from Test Plan and Test Repository board.

//Printing Tests of the 1st level
&{for issues}
${Key} - ${Summary} 
&{end}

//Printing folders and their tests
#{for f=FoldersCount}
Heading 2 -> ${Folders[f].Name}
     #{for ft=Folders[n].TestsCount}
         ${Folders[f].Tests[ft].Key} - ${Folders[f].Tests[ft].Summary} 
     #{end}
#{end}