Files app:

- removed file list template, now rendering list from JSON response
- FileList.addFile/addDir is now FileList.add() and takes a JS map with all required
  arguments instead of having a long number of function arguments
- added unit tests for many FileList operations
- fixed newfile.php, newfolder.php and rename.php to return the file's
  full JSON on success
- removed obsolete/unused undo code
- removed download_url / loading options, now using
  Files.getDownloadUrl() for that
- server side now uses Helper::getFileInfo() to prepare file JSON response
- previews are now client-side only

Breadcrumbs are now JS only:

- Added BreadCrumb class to handle breadcrumb rendering and events
- Added unit test for BreadCrumb class
- Moved all relevant JS functions to the BreadCrumb class

Public page now uses ajax to load the file list:

- Added Helper class in sharing app to make it easier to authenticate
  and retrieve the file's real path
- Added ajax/list.php to retrieve the file list
- Fixed FileActions and FileList to work with the ajax list

Core:

- Fixed file picker dialog to use the same list format as files app

fixing javascript error where $(Files.breadcrumbs[1]).get(0) returns undefined - happens on resize to a very small width

don't allow to create a file or folder named 'Shared' in the root folder, also exclude all combinations of lower and upper case letters

- When all files are selected, do not send the whole file list
- Download will trigger download for the parent folder, also works
  with root
- Delete will send "allfiles" to the server that will find the file
  list or the passed directory by itself

fixes #7119
fixes #7120
fixes #7121
fixes #7122

- fixed file name validation unit test
- added "\n" as forbidden character in isFileNameValid()

- Also fixes a few JSHint warnings in files app
- Added "global" comment on top of files app to suppress warning and
  also inform devs about what globals are use

Changed jQuery selector for public preview to public_upload to correctly show preview

- Refactored file tr lookup into FileList.findFileEl that uses
  filterAttr to avoid escaping issues in jQuery selectors
- Fixed versions and sharing app to properly escape file names in
  attributes

As per @kabum request, indention on line 694 has been fixed.

Added spinner to file icon when moving to new folder or out of folder.

Commit is related to #6051

Fixes #5775

Previously, the storage statistics were always for the root dir.
This means that the upload button would always show the limit for the
root dir, even when uploading to a shared dir or external storage.

This fix adds a "dir" argument to getstoragestats.php.

After uploading, the quota value wasn't refreshed.
This fix refreshes the quota value after files have been scanned or
uploaded.

calling getstoragestats.php only if a user is logged in because this call requires a user to be logged in

closest will search up the tree

forward port of https://github.com/owncloud/core/pull/5647#discussion-diff-7341163
trust me, I know what I'm doing

Fixes #5534

- show tooltip when violating naming constraints while typing
- when target filename exists on server fallback to dialog to interrupt the users flow because something unexpected went wrong
- fixes #5062
- also fixes some whitespace and codestyle issues in files js
- uses css selector over filterAttr in touched js files

Preview images are now pre-loaded before being set on the file element.

This fixes #5135 and prevents a white space to be displayed while the
thumbnails is being loaded.

give getSelectedFilesTrash() a unique name for the trash.js to avoid confusions with the same function in files.js

Ajax loading is not supported yet for public files view.
This fix disabled the history API, ajax loading and ajax directory
switch in public mode until it is implemented properly.

Now correctly reinitializing the breadcrumb drop zone after ajax
navigation.

This also fixes dropping onto the "files" app icon.

Some apps like the files_trashbin app do not set a directory on its
"home" breadcrumb link.

This fix makes sure that the click event doesn't do anything in that
case and lets the browser open the link.

This fixes the "home" icon in the trashbin app which now correctly
reopens the files app.

The message for invalid private key was too long and didn't fit in the
notification box. This fix reduces the message to fit properly by
removing the extra information.

use 96x96 as 64x64 thumbnails in conflicts dialog, 64x64 looks very blocky ... maybe something is wrong there

use places/folder icon,
move link construction to JS,
only show icon on hover,
use 'searchresult' as css class name,
add filter/unfilter methods,
highlight searched files in current filelist
only filter when correct FileList is present