Fix slideshow buttons being invisible

Remove uneeded file

Replace echo with `p` or `print_unescaped`

Using echo instead of `p` or `print_unescaped` is a bad style, to prevent people from copying it  I've adjusted it.

This file seems not to be actually used anywhere.

Show higher resolution previews for high dpi screens

dont scan not existing files in View->getFileInfo

Do not expire chunks while checking for their existence

extending javascript line length to 120

adding xit to globals

Allow reusing FileInfo for getStorageInfo

Ajaxify files list for files + trashbin + public page

The expiration should be done by the gc() function on login, not while
isComplete() is calling hasKey() for every chunk.

Type hinting

Fix error log spam

Fix uploading files containing a # in the path for webdav

Regression from e002b724

Reuse known free space in the files app

there is no need to re-calculate the shares after a touch

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

fix h3 style, move out from settings to apps CSS

Upgraded phpseclib to version 0.3.6 (SFTP ext storage)

Fix admin-dir_permissions redirection when cannot write warning is shown.

always encrypt files to owner