Some revisions to cbbrowne Planck keymap, and a preliminary xd75 keymap (#1715)

* Add HOME/END keys as upper/lower on arrow-up/down

* Reduce .hex file size by turning off unneeded options

* Put digit keypad onto left hand upon RAISE; this will sometimes be preferable to double-hits of right hand

* Latest super latest version merge

* cbbrowne keymap for XD75re

* starting notes on XD75re keymap plans

* First draft of bottom row of QWERTY

* Switch my special bottom line over to QCENT

* Dunno

* Filling in wanted keys, bit by bit...

* Add copyright, extra macro

* Clean up comments, remove some experimental code I didn't like

* TODO plans for xd75re

* clean up keyboard layout

* QCENT2 is my new experiment for the main keyboard...

* Add a few more main layer keys, and modify LOWER to shift things outwards to conform with main layer

* Clean up RAISE layer to conform with main layer, remove QCENT layer as QCENT2 is the new thing

* More xd75 changes, now that I actually have it in hand

* shift keymap around, as original attempt was a bit too aggressive in keeping to the edges

* more revs to XD75

* Dropping parts of the centre keypad in favor of Keys I Really Need

* Improve documentation to conform with how builds are done now

* Improve documentation to conform with how builds are done now

* Add cbbrowne rules file as alternative to having the rules in Makefile

* Makefile not needed anymore for individual keymap

keyboards/planck/keymaps/cbbrowne/readme.md

@@ -61,7 +61,7 @@ doing sundry experimentation:
    interesting idea to express the maps rotated 90%, so that you
    only need to fit 4 symbols onto each line, rather than 12.
 
-   I used enums to manage layer IDs and macro IDs so that I don't need
+   I use enums to manage layer IDs and macro IDs so that I don't need
    to care (beyond "start at 0", and arguably even that's not needed)
    about their values.
 
@@ -102,12 +102,21 @@ unwise things again...
   * I use tmux quite a lot; the mollat keymap seems to have some
     interesting helpers.  It might be interesting to add a "tmux
     layer," or to have a few keys in a layer oriented towards that
+    - Keys for...
+      - Picking windows 0 thru 8
+      - next/prev/new window
   * The mollat tmux layer also suggests some thoughts about Emacs
-    helpers.
+    helpers.    
   * I do not presently have anything that handles X11 screen
     switching, as with Control-Alt-various
   * I ought to probably look into KC_LEAD, to have some key combos
     that do not need to be concurrent
   * The jeebak keymap seems to have some neat ideas:
     - Number layer which is aggressive about having numbers in several places
-    - Touch layer seems interesting
+    - TouchCursor layer seems interesting
+      - It sets up a layer with cursor keys on the home keys
+  * The jeremy-dev keymap has some very interesting concepts
+    - Shift hands outwards; the special keys go in the center
+    - Symbol layer has some compound keys for C operators like /=, *=, -=, +=, ...
+    - This is likely what I'll use for my XD75re, and maybe I'll fork a
+      planck keymap for similar