Fix quantum keymapextra italian (#6779)

Fix quantum keymapextra italian (#6779)

* remove IT_PIPE duplicate and add IT_GRAD

IT_PIPE was declared 2 times, ones as ° and once as |. I changed the first declaration and called it IT_GRAD. I even fixed the definition because the ° in Italian is obtained with LSFT(IT_AACC)

* rename IT_GRAD to IT_DEGR

* add    missing plus_and_minus

* fix missing IT_ACUT definition

* change KC_LALT(KC_LSFT to LALT(LSFT

* Fix alignment

* remove leftover

* fix issue generated with chars while pushing

* fix typo

* fix LCBR and RCBR

* fix euro symbol

* fix RBRC

* change IT_LESS form KC_NUBS to KC_GRAVE

* add IT_TILDE and change IT_GRAV to IT_GRAVE

* add missing legends for accented vowels

* format for readability

* revert to commit befor I edit it

* initial commit

* edited to be easier to compare to _ansi.h

* remove keymap_italian_osx_iso.h and rename with edits keymap_italian_osx_ansi.h to keymap_italian_osx.h

I found out there were no difference at all

* fix missing #endif

* rename quantum/keymap_extras/keymap_italian_osx.h to quantum/keymap_extras/keymap_italian_ansi.h

Now this file is a clone of the keymap_italian.h that appears to be working only for ISO keyboards. It also contains a few improvements for IT_PIPE (defined two times) and IT_ACUT (missing definition). Additionally it redefines LCBR and RCBR to LSFT(IT_LBRC) and LSFT(IT_RBRC)

* rename file

* redefines IT_BKSL and IT_PIPE based on KC_BKSL

* add new osx_iso and osx_ansi version for italian.h and align BKSL to BSLS, fix double definition of PIPE