Show warning when invalid user was passed

Sometimes there are bugs that cause setupFS() to be called for
non-existing users. Instead of failing hard and breaking the instance,
this fix simply logs a warning.
Remove phpass and migrate to new Hasher interface

This PR removes phpass and migrates to the new Hasher interface.

Please notice that due to https://github.com/owncloud/core/issues/10671 old hashes are not updated but the hashes are backwards compatible so this shouldn't hurt.
Once the sharing classes have a possibility to update the passwords of single shares those methods should be used within the newHash if block.
Warn for password reset when files_encryption is enabled

This patch wil warn the user of the consequences when resetting the password and requires checking a checkbox (as we had in the past) to reset a password.

Furthermore I updated the code to use our new classes and added some unit tests for it :dancers:

Fixes https://github.com/owncloud/core/issues/11438
Fix scrutinizer issues
Remove uneeded import
Use correct route instead

THX @schiesbn
(I should setup a mail server on my local system...)
Add "postPasswordReset" hook
add password as parameter to the signal so that the encryption can create a new key-pair
listen to the post_passwordReset hook, backup the old keys and create a new key pair for the user
Hide submit button after password change

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.
fix unreadable label in warning box
Show spinner
center spinner
Added function to load translations from JS

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.
Ignore port for trusted domains

This lead to a lot of confusion in the past and did not really offer any value. Let's remove the port check therefore. (it's anyways not really a part of the domain)

Fixes https://github.com/owncloud/core/issues/12150 and https://github.com/owncloud/core/issues/12123 and also a problem reported by @DeepDiver1975.

Conflicts:
	lib/private/request.php
Add repair steps for legacy config files

Remove all ports from the trusted domains

Conflicts:
	lib/private/repair.php
	lib/repair/repairconfig.php
User management search just searches users - adjust label of input field - fixes #10229
drop unneeded var_dump - fixes #9997
Merge pull request #12272 from owncloud/drop-var_dump

drop unneeded var_dump - fixes #9997
Merge pull request #12270 from owncloud/fix-search-label

User management search just searches users - adjust label of input field...