Norman layout for the minidox keyboard (#5747)

Norman layout for the minidox keyboard (#5747)

* Norman layout with Lower and Raise layers working

* Add keymap_extra def for Norman layout
* Re-org'ed the modifiers as explained in the Readme
* Corrected colour legend for KLE that the Readme links to

* Use #pragma once in header file

* Use pragma once and move user config to config.h

* Move definitions to the right file and correct link in Readme

* Move def of NM_COLN to the logical place in header file

* Add sendstring_norman.h for when the laptop layout is not QWERTY

* Update quantum/keymap_extras/sendstring_norman.h

Co-Authored-By: lehoff <torben.lehoff@gmail.com>