Bug 33703: Add Masikto core/kit for date masking

Bug 33703: Add Masikto core/kit for date masking

To test:
1. Apply patch
2. Restart all, clear browser cache
3. In the staff interface start testing some flatpickr instances with direct inputs.
4. Try entering your dates without delimiters, '/' or '-', or '.'.
5. Make sure the dates are well formed.
6. Test with each of dateformat's Koha supports. ( system preference 'dateformat').
7. Add/edit an item with the dateaccessioned.pl plugin loaded, making the dates are well formed.
8. Make an item bookable by going to the item tab of a record and setting at least 1 item to "Bookable:".
9. Now "Place booking", which should trigger a modal.
10. In the "Period" date picker, which is a range, the dates should NOT be formatted.
11. Log in to the OPAC and try some date pickers ( self reg/borrower mod/ect )

Some places to test:
    -Patron record date of birth
    -Patron record registration date
    -Patron record expiry date
    -Checkouts, manually set a due date
    -Patron category, enrollment period

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>