Fixed too generic checkbox and link selectors

Show spinner for all files when deleting all

remove leftcontent and rightcontent CSS, no longer needed

Issue/8131 Fix emitting of filesystem related hooks

It turns out that the sharing dropdown is embedded into the table row
for some reason.

This fix makes use of a more specific selector for the checkboxes and
file name links to make sure it doesn't spill into any other potential
elements like the sharing dialog.

fix shouldEncrypt() method and improved decryptAll() unit tests

Handle return values better from Filesystem::getMountBy*

after being uploaded in .part files

Fix #8131

The write-hook also is triggered for created files

Fix #8131

do not check 'remember' log in by default

Update 3rdparty

Fixes login / logout when HTTP Basic Headers are avilable.

Update outdated comment

Infinite scrolling for files app

remove preview office fallback as it makes too much trouble and generates inacceptable results

Escape literal dots in mod_rewrite regexes

Fixed drag and drop code to use FileList.getSelectedFiles() instead of
the visible DOM elements.

Now using _.bind() for event handlers so we can use "this" which is more
readable than a static access to FileList.

The file selection is now based on the internal model array
FileList.files instead of the visible checkboxes.

This makes it possible to virtually select files that haven't been
rendered yet (select all, then deselect a visible one)

Added more unit tests for selection (with shift and ctrl as well)

Removed "insert" flag, inserting is by default for FileList.add().
Added "animate" flag to FileList.add().
Added logic to correctly detect when to insert/append elements whenever
the insertion point is visible or not.
Fixed "render next page" logic to work correctly when many pages of
files have been added.

The FileList.files model is now updated with file operations.
Adding files to the list will add to the model first, then to the DOM.
If the insertion point isn't visible yet, the file won't be added to the
DOM until the user scrolls down.

Updated unit tests to include checking for the correct insertion point.

- moved file selection code to FileList
- fix selection summary when all files are selected
- nextPage now auto-selects files if "select all" checkbox is checked
- fixed trashbin to use the same selection logic as FileList

- moved the summary code into a new class FileSummary
- FileSummary is calculated only once, then updated with add/remove
- added new OC.Util namespace for JS utility functions