Fix #10836

Fixes https://github.com/owncloud/core/issues/12650

Potentially fixes https://github.com/owncloud/core/issues/12580

add ldap-search command to occ

Conflicts:
	apps/user_ldap/appinfo/register_command.php

LDAP search filter creation changes:

1. do not prepend * wildcard to search terms. Will result in faster search, but
you don't find "foobar"  when looking for "bar"
2. advanced behaviour when search string contains a space and multiple search
attributes are present. The search string is split into single words. The
resulting filter requires that each word at least appears once in any search
attribute. This is supposed to return better results in big LDAPs.

trim search string before passing it on

* Vector files such as Illustrator files currently show the "image"
icon. I propose to add a new type to mimetypeIcon() called
"image/vector" and which would be used by SVG as well
* We can use the current image-svg+xml icon, but would simply rename it
to image-vector
* The black and white "image" icon looks too much like a settings icon.
A simple picture representation pasted over the file icon should work

Relieve @PVince from having to write it all the time ;-)

If the webroot has been set to an empty value or ownCloud has been installed at the root location (`/``) there is a fair chance that the redirect for password resets does not work at all.

This means that while the password is getting resetted the user is not redirected to the login page.

I'm aware that it might be better to just set the webroot to `/` in those cases but this patch is better in the regard that it cannot break stuff.

Thanks to @PVince81 for helping me debugging this. (I'm a moron and assumed it couldn't be THAT easy)

Reported by @cdamken

For apps that support async translation loading, a new function
OC.L10N.load() can be used to asynchronously load the translations
for a given app.

Creating a new key pair can take 1-2 seconds. So it could happen that the user click the "Reset password" button again which can lead to many nasty things, e.g. we could create two new key pairs in parallel.

THX @schiesbn
(I should setup a mail server on my local system...)