Bug 26285: Follow E.164 pattern for validating SMS numbers

Bug 26285: Follow E.164 pattern for validating SMS numbers

Currently, Koha is not correctly validating SMS numbers using
E.164. This causes Australian phone numbers without a country code
to fail validation.

This patch uses the E.164 pattern of 1-3 digits for country code,
prefixed by a + symbol, and followed by up to 12 digits for
the remainder of the phone number.

To test:

0. Don't apply patch yet
1. Set "SMSSendDriver" to "Anything"
2. Go to http://localhost:8081/cgi-bin/koha/members/memberentry.pl?op=modify&destination=circ&borrowernumber=51
3. Type in 0455555555 and note "Please enter a valid phone number." message in browser

6. Apply the patch

7. Go to http://localhost:8081/cgi-bin/koha/members/memberentry.pl?op=modify&destination=circ&borrowernumber=51
8. Type in 0455555555 and note no validation error
9. Type in +61455555555 and note no validation error
10. Type in 123456789012 and note no validation error
11. Type in 1234567890123 and note "Please enter a valid phone number." error
12. Type in +900123456789012 and note no validation error
13. Type in 900123456789012 and note "Please enter a valid phone number." error

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>