[ticket/12183] Update user_newpasswd column to length of 255 in schema files

PHPBB3-12183
[ticket/12183] Add migration file for updating user_newpasswd column

PHPBB3-12183
[ticket/12183] Add functional test for user password reset

PHPBB3-12183
[ticket/12183] Make sure to undo changes to config in forgot_password_test

The forgot_password_test disables the password reset functionalty but doesn't
enable it again afterwards.

PHPBB3-12183
[ticket/12183] Test activating new password after reset

PHPBB3-12183
[ticket/12183] Move user_newpasswd, user_actkey below user_pass_convert

PHPBB3-12183
[ticket/12183] Test that login with old password doesn't work after reset

PHPBB3-12183
[ticket/12183] Check if database columns were updated before changing them

PHPBB3-12183
Merge pull request #2025 from marc1706/ticket/12183

[ticket/12183] Update user_newpasswd column in users table for passwords manager