Ajaxify files list for files + trashbin + public page

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

Allow using "/" in "overwritewebroot"

is shown.

Correctly read the full stream in file_get_contents

- now correctly parse query strings with '+' signs
- empty values are now parsed either as null or empty string
- added unit test for parseQueryString()

Fixed broken delete file action

idn_to_ascii is only used if available

Make getPath work for shared files

Makes #app-navigation a part of app management.

Correct the remembering of the trashbin app state in encryption test

Fix dirInfo check when dir does not exist

External Storage: change confusing 'applicable' to 'available for', default to »All Users«

Fixed chunking and insufficient storage check

fix update to remove shares where file doesn't exist on postgres