Bug 17302: Add Koha::Util::Normalize for normalization functions

Bug 17302: Add Koha::Util::Normalize for normalization functions

This patch introduces Koha::Util::Normalize, which includes the following normalization routines
that need no explanation:

- remove_spaces
- upper_case
- lower_case

and it also includes:

- legacy_default: which basically does what C4::Matcher::_normalize does.

All routines functionality are fully tested with the included in the included tests.

To test:
- Apply the patch
- Run:
  $ prove t/Koha/Util/Normalize.t
=> SUCCESS: All tests pass
- Sign off :-D

Edit: Added Exporter to explicitly export the routines.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>