Input date

I extracted 2.x code by mairi out of the monster patch in #2680567: Miscellaneous features and minor bug fixes and backported it to 7.x-1.x.
It introduces a workbench_scheduler_date_format variable that can be set with drush or devel and controlled with a feature. No UI in this patch.

Added an implementation of hook_uninstall().

Hi Eric_A, thanks for your help on this. I grabbed your patch and took it one step further. Instead of using a variable I used the internal Drupal date format 'short'. This also accounts for locale. In a later commit we can add a settings page where admins can change the date format to 'medium', 'long' or any other custom date format.

I also replaced 'Y-m-d H:i:s' with the DATE_FORMAT_DATETIME constant.

Note: This is for version 7.x-2.x

Thanks so much @Eric_A @partdigital - this community really is awesome :) I have finally managed to come back to this & I need to take the latest 7.x-2.x-dev & apply the patches I had started splitting down. I'll try this one in place of what I have for date format, and will review #2717419-5 as well. I'll create issues for the remaining parts. Sorry it's taken so long!

@Eric_A @partdigital I have applied the patch from #4 locally and it is looking good. +1 for not needing the additional variable setting and -1 to me for not thinking the Drupal date format 'short' in the original patch :)

This has been rolled into the latest dev release. Thanks for your help everyone!