Support ios to default keymap (#3118)

* add some comment about Helix customize and auto-setup RGBLIGHT_LIMIT_VAL

* add define USB_MAX_POWER_CONSUMPTION

* Helix keyboard OLED, RGBLIGHT enable/disable control integrate into rules.mk

rules.mk: add 4 Variables for compile control.

   # Helix keyboard customize
   # you can edit follows 4 Variables
   #  jp: 以下の4つの変数を必要に応じて編集します。
   OLED_ENABLE = no            # OLED_ENABLE
   LED_BACK_ENABLE = no        # LED backlight (Enable WS2812 RGB underlight.)
   LED_UNDERGLOW_ENABLE = no   # LED underglow (Enable WS2812 RGB underlight.)
   LED_ANIMATIONS = yes        # LED animations

config.h: auto set RGBLED_NUM by HELIX_ROWS and rules.mk's define

* HELIX_ROWS define move from config.h to rules.mk

* add readme.md

* rename readme.md to readme_jp.md

* add readme.md and modify readme_jp.md

* change helix/ssd1306.c for select glcdfont.c position

* add variable LOCAL_GLCDFONT into each keymaps rules.mk

* Add iPhone/iPad LED support to Helix default keymap

* add Freggy keymap

* adjust the delay of serial.c

* change readme

* renumber _ADJUST for shrink program size

keyboards/helix/rev2/keymaps/default/keymap.c

@@ -27,12 +27,14 @@ extern uint8_t is_master;
 // The underscores don't mean anything - you can have a layer called STUFF or any other name.
 // Layer names don't all need to be of the same length, obviously, and you can also skip them
 // entirely and just use numbers.
-#define _QWERTY 0
-#define _COLEMAK 1
-#define _DVORAK 2
-#define _LOWER 3
-#define _RAISE 4
-#define _ADJUST 16
+enum layer_number {
+    _QWERTY = 0,
+    _COLEMAK,
+    _DVORAK,
+    _LOWER,
+    _RAISE,
+    _ADJUST
+};
 
 enum custom_keycodes {
   QWERTY = SAFE_RANGE,
@@ -526,15 +528,10 @@ void matrix_update(struct CharacterMatrix *dest,
 
 //assign the right code to your layers for OLED display
 #define L_BASE 0
-#define L_LOWER 8
-#define L_RAISE 16
-#define L_FNLAYER 64
-#define L_NUMLAY 128
-#define L_NLOWER 136
-#define L_NFNLAYER 192
-#define L_MOUSECURSOR 256
-#define L_ADJUST 65536
-#define L_ADJUST_TRI 65560
+#define L_LOWER (1<<_LOWER)
+#define L_RAISE (1<<_RAISE)
+#define L_ADJUST (1<<_ADJUST)
+#define L_ADJUST_TRI (L_ADJUST|L_RAISE|L_LOWER)
 
 static void render_logo(struct CharacterMatrix *matrix) {