add checkbox to toggle show/hide hidden files
persist show hidden setting
fix settings menu layout
test ApiController::showHiddenFiles
don't show hidden files by default
Store config in Backbone model and inject it into FileList
Filter files only temporarily when rending the file list
Fix file rename validation
jquery.fileupload offers the [`pastezone`](https://github.com/blueimp/jQuery-File-Upload/wiki/Options#pastezone) functionality. This functionality is enabled by default and if somebody copy-pastes something into Chrome it will automatically trigger an upload of the content to any configured jquery.fileupload element embedded in the JS.
This implementation triggers some problems:
1. The pastezone is defined globally by default (🙈). So if there are multiple fileupload's on a page (such as in the personal settings) then stuff is going to be uploaded to all embedded uploads.
2. Our server code is not able to parse the data. For example for uploads in the files app we expect a file name which is not specified => Just an error is thrown. You can reproduce this by taking a file into your clipboard and in Chrome then pressing <kbd>CTRL + V</kbd>.
3. When copy-pasting some string from MS Office on the personal page a temporary avatar with said content is created.
Considering that this is anyways was never working at all and causes bugs I've set the `pastezone` to `null`. This mens that upload via copy and paste will be disabled.
Lesson learned: Third-party JS libraries can have some weird details.
When receiving a shared file, the quota for that file counts in the
owner's storage, not the current user's storage.
To make it possible to overwrite the file even when the current user
doesn't have enough space, the quota check is deferred for such files.
Plugins can extend _getWebdavProperties to add custom properties.
These should not be added to the original properties list, so now the
FileList makes a copy of the array.
Since Webdav doesn't contain that information, we need to rely on the
parent folder's mount type to find out whether a child item is a
shared/external root or not.
Fixed the mount type detection logic and added unit test.
Also added a fix that ignores detection if no parent folder exists (ex:
shared file list, favorites, etc)
For received shares, the delete action becomes "Unshare" and for
personal mounts it becomes "Disconnect storage".
This also makes it possible from now on to pass a function to a file
action's "displayName" attribute.
The public page now uses the public.php/webdav endpoint.
Also enabled more file operations like rename, move, delete and create
folder from the public page, which are now all possible thanks to the
public.php/webdav endpoint.
The text editor app will register this instead.
Also made "fileList" a non-private attribute to make it possible for
plugins to access the attached file list object.
