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>

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+# Minidox Norman Layout by LeHoff
+Based on the QWERTY layout created by Khitsule.
+![lehoff](https://i.imgur.com/rKTdymp.png)
+
+[KLE link](http://www.keyboard-layout-editor.com/#/gists/86ec49f9f820a8b9b36f6e0d2ef8fff7)
+
+## Layers
+| Layer | Legend |
+| ----- | ------ |
+| Base  |  Top left (black) |
+| Lower | Bottom right (red) |
+| Raise | Top right (orange) |
+| Adjust | Front print |
+
+## Features
+* Raise/lower layers focus first on one-handed use
+* Numpad on right hand with raise layer
+* Navigation on left hand with lower layer (ESDF)
+    * D refers to desktop left/right on Win 10 (win+ctrl+left/right)
+* Heavy use of hold/tap dual function keys - from left to right:
+    * Cmd/Enter
+    * Raise/Esc
+    * Shift/Backspace
+    * Ctrl/Space
+    * Lower/Tab
+    * Alt/Enter
+
+
+## Modifier Placement Rationale
+
+There are several major driving forces at play:
+
+* I use MacOS.
+* I'm Danish so the Alt and Shift-Alt layers in MacOS simply have to work.
+* I use Vim for coding.
+* I use org-mode in Emacs to keep track of my time.
+
+* Space is on the right hand side because I almost exclusively use my right hand thumb for
+  space.
+* Cmd is on the left since I often use Cmd+click to open a link in a new tab in Safari.
+* Due to my usage of Vim Esc got a spot on the modifier row.
+* Tab is on the right to enable easy navigation between winows with Cmd+Tab.
+* Shift is on the left since org-mode uses Ctrl+arrows to manipulate task state quickly,
+ and since the arrow keys are activated using Lower (which has been moved to the right) and S, E, T,
+ and D, it works well that way. 
+* Ctrl is on the right since Ctrl+<0-9> is used in MacOS to switch between spaces.
+* Enter is on both sides since Enter is often used together with all of the modifiers. E.g.,
+  Cmd+Enter to send mails in most situations, but Ctrl+Enter is used in Emacs to create a
+  new task in org-mode.
+ 
+This means that arrows and digits are being modified from the other hand, which could be
+bad for gaming, so if you're into that you might want to re-think a few things, but in
+that case you are probably using a Windows machine and then there are other constraints
+you have to deal with.
+
+