Fix results from /print/files

[onmax]

Currently the API's answer is:

[
  {
      id: number,
      name: string,
      files: Array with info of the files,
      folders: [{
         id: number,
         name: string,
         root: boolen,
         folder: number
       ]
   }
]

The API's answer should be:

[
  {
      id: number,
      name: string,
      files: Array with info of the files,
      folders: [{
         id: number,
         name: string,
         files: Array with info of the files,
         folders: [
             id: number,
             name: string,
             files: Array with info of the files,
             folders: ...  // more folders
       ]
   },
   {
      // Same structure as above but with "shared-with-me" files
   }
]

To do:

• Fix problem with folders array,
• Add "shared-with-me" structure