handwired/gamenum Refactor, Configurator support and readme cleanup (#4563)

* handwired/gamenum: refactor

- layout macro KEYMAP renamed to LAYOUT
  - white space changes for alignment
- default keymap
  - now uses #include QMK_KEYBOARD_H
  - updated layout macro names
  - white space changes (for readability)

* handwired/gamenum: Configurator support

* handwired/gamenum: readme cleanup

- renamed file to lowercase
- updated to match current QMK template more closely
- edits to reflect the other changes in this PR

keyboards/handwired/gamenum/gamenum.h

@@ -3,7 +3,7 @@
 
 #include "quantum.h"
 
-#define KEYMAP( \
+#define LAYOUT( \
 	k00, k01, k02, k03, \
 	k10, k11, k12, k13, \
 	k20, k21, k22,      \

keyboards/handwired/gamenum/info.json

@@ -0,0 +1,30 @@
+{
+  "keyboard_name": "gamenum", 
+  "url": "", 
+  "maintainer": "qmk", 
+  "width": 4, 
+  "height": 5, 
+  "layouts": {
+    "LAYOUT": {
+      "layout": [
+        {"label":"Fn", "x":0, "y":0}, 
+        {"label":"/", "x":1, "y":0}, 
+        {"label":"*", "x":2, "y":0}, 
+        {"label":"-", "x":3, "y":0}, 
+        {"label":"7", "x":0, "y":1}, 
+        {"label":"8", "x":1, "y":1}, 
+        {"label":"9", "x":2, "y":1}, 
+        {"label":"+", "x":3, "y":1, "h":2}, 
+        {"label":"4", "x":0, "y":2}, 
+        {"label":"5", "x":1, "y":2}, 
+        {"label":"6", "x":2, "y":2}, 
+        {"label":"1", "x":0, "y":3}, 
+        {"label":"2", "x":1, "y":3}, 
+        {"label":"3", "x":2, "y":3}, 
+        {"label":"0", "x":0, "y":4, "w":2}, 
+        {"label":".", "x":2, "y":4}, 
+        {"label":"Ent", "x":3, "y":3, "h":2}
+      ]
+    }
+  }
+}

keyboards/handwired/gamenum/keymaps/default/keymap.c

@@ -1,30 +1,26 @@
-#include "gamenum.h"
+#include QMK_KEYBOARD_H
-#include "action_layer.h"
-#include "eeconfig.h"
 
 
-#define _______ KC_TRNS
-
 #define DEF 0
 #define HDN 1
 #define OSY 2
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
-[DEF] = KEYMAP(
+  [DEF] = LAYOUT(
     KC_FN0,  KC_SLSH, KC_ASTR, KC_MINS, \
     KC_7,    KC_8,    KC_9,    KC_PLUS, \
     KC_4,    KC_5,    KC_6,             \
     KC_1,    KC_2,    KC_3,             \
     KC_0,             KC_DOT,  KC_ENT   \
   ),
-[HDN] = KEYMAP(
+  [HDN] = LAYOUT(
     KC_FN1,  KC_1,    KC_2,    KC_3,    \
     KC_Q,    KC_W,    KC_E,    KC_R,    \
     KC_A,    KC_S,    KC_D,             \
     KC_Z,    KC_X,    KC_C,             \
     KC_LSFT,          KC_LALT, KC_SPC   \
   ),
-[OSY] = KEYMAP(
+  [OSY] = LAYOUT(
     KC_A,    KC_Q,    KC_1,    KC_FN2,  \
     KC_S,    KC_W,    KC_2,    KC_LALT, \
     KC_D,    KC_E,    KC_3,             \

keyboards/handwired/gamenum/readme.md

@@ -1,5 +1,16 @@
-GameNum firmware
+# GameNum
-======================
+
+A handwired standard numpad oriented toward gaming on the go.
+
+Keyboard Maintainer: [The QMK Community](https://github.com/qmk)  
+Hardware Supported: GameNum, Pro Micro  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/gamenum:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
 ## Board overview
 
 The GameNum was designed to facilitate the use of mechanical keys for gaming even when your packing space is limited.
@@ -34,7 +45,7 @@ Keep in mind here that the number after the name should correspond with the numb
 Next thing to do is to add the actual layer for the keymap.
 
 ```
-[DEF] = KEYMAP(
+  [DEF] = LAYOUT(
     KC_FN0,  KC_SLSH, KC_ASTR, KC_MINS, \
     KC_7,    KC_8,    KC_9,    KC_PLUS, \
     KC_4,    KC_5,    KC_6,             \
@@ -72,31 +83,3 @@ Now go back to `keymap.c` and look for the `process_record_user` function. The f
 ```
 
 This is the code for the KC_FN1 button. Notice how we check against what key is pressed in the case and then set pin C6 low and pin D4 high. Adjust this as you see fit.
-
-
-## Quantum MK Firmware
-
-For the full Quantum feature list, see [the parent readme.md](/docs/README.md).
-
-## Building
-
-Download or clone the whole firmware and navigate to the keyboards/handwired/gamenum folder.
-Read the README.md for the qmk repository on how to set up your developer enviroment to build your firmware with.
-Building firmware on Windows can be a bit of a hassle. Linux is a lot easier to use if you have some experience with it. A raspberry pi will already be able to build the firmware for you.
-Once your dev env is set up, you'll be able to type `make` to generate your .hex - you can then use AVRDudess to program your .hex file.
-
-### Default
-
-To build with the default keymap, simply run `make`.
-
-### Other Keymaps
-
-To build the firmware binary hex file with a keymap just do `make` with `keymap` option like:
-
-```
-$ make keymap=[default|jack|<name>]
-```
-
-Keymaps follow the format **__keymap.c__** and are stored in folders in the `keymaps` folder, eg `keymaps/my_keymap/`
-
-