feat(extensions): most of the extensions implementation, by kdb424

boards/reviung39/README.md

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+# Reviung39
+
+![Reviung39](https://boardsource.imgix.net/d6215164-6100-4b72-b355-1a67b7704463.jpg?raw=true)
+
+Reviung39 is a 39 key keyboard designed by gtips. The Reviung39 sits somewhere between an Atreus and a Corne, you get some nice ergonomic benefits based on its quasi-split design and since a true split keyboard isn't for everyone, this is an awesome middle ground. I find this keyboard extremely comfortable to use.
+
+kb.py is designed to work with the nice!nano
+
+Hardware Availability: [PCB & Case Data](https://github.com/gtips/reviung)  
+
+Retailers (USA)  
+[Boardsource](https://boardsource.xyz/store/5ecb734486879c9a0c22dab3)  
+
+Extentions enabled by default  
+- [Layers](https://github.com/KMKfw/kmk_firmware/tree/master/docs/layers.md) Need more keys than switches? Use layers.
+- [RGB](https://github.com/KMKfw/kmk_firmware/tree/master/docs/rgb.md) Light it up
+- [ModTap](https://github.com/KMKfw/kmk_firmware/tree/master/docs/modtap.md) Allows mod keys to act as different keys when tapped.
+
+Common Extentions
+- [Power](https://github.com/KMKfw/kmk_firmware/tree/master/docs/power.md) Powersaving features for battery life

boards/reviung39/kb.py

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+import board
+
+from kmk.kmk_keyboard import KMKKeyboard as _KMKKeyboard
+from kmk.matrix import DiodeOrientation
+
+
+class KMKKeyboard(_KMKKeyboard):
+    row_pins = (
+        board.P0_31,
+        board.P0_29,
+        board.P0_02,
+        board.P1_15,
+        board.P1_13,
+        board.P1_11,
+        board.P0_10,
+    )
+    col_pins = (
+        board.P0_22,
+        board.P0_24,
+        board.P1_00,
+        board.P0_11,
+        board.P1_04,
+        board.P1_06,
+    )
+    diode_orientation = DiodeOrientation.COLUMNS
+    i2c = board.I2C
+    powersave_pin = board.P0_13

boards/reviung39/main.py

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+from kb import KMKKeyboard
+from kmk.extensions.rgb import RGB
+from kmk.keys import KC
+from kmk.modules.layers import Layers
+from kmk.modules.modtap import ModTap
+
+keyboard = KMKKeyboard()
+
+# Adding extentions
+rgb = RGB(pixel_pin=keyboard.rgb_pixel_pin, num_pixels=keyboard.rgb_num_pixels, val_limit=100, hue_default=190, sat_default=100, val_default=5)
+
+modtap = ModTap()
+layers_ext = Layers()
+
+keyboard.modules = [layers_ext, modtap]
+keyboard.extensions = [rgb]
+
+# Cleaner key names
+_______ = KC.TRNS
+XXXXXXX = KC.NO
+
+LOWER = KC.MO(1)
+RAISE = KC.MO(2)
+
+keyboard.keymap = [
+    [  #QWERTY
+        KC.ESC,   KC.N1,  KC.N2,   KC.N3,   KC.N4,   KC.N5,                    KC.N6,   KC.N7,   KC.N8,   KC.N9,   KC.N0,   KC.GRV,
+        KC.TAB,   KC.Q,   KC.W,    KC.E,    KC.R,    KC.T,                     KC.Y,    KC.U,    KC.I,    KC.O,    KC.P,    KC.MINS,
+        KC.LCTRL, KC.A,   KC.S,    KC.D,    KC.F,    KC.G,                     KC.H,    KC.J,    KC.K,    KC.L,    KC.SCLN, KC.QUOT,
+        KC.LSFT,  KC.Z,   KC.X,    KC.C,    KC.V,    KC.B,  KC.LBRC, KC.RBRC,  KC.N,    KC.M,    KC.COMM, KC.DOT,  KC.SLSH, KC.RSFT,
+                                   KC.LALT, KC.LGUI, LOWER, KC.SPC,  KC.ENT,   RAISE,  KC.BSPC, KC.RGUI
+    ],
+    [  #LOWER
+        KC.F1,  KC.F2,    KC.F3,   KC.F4,   KC.F5,   KC.F6,                     KC.F7,   KC.F8,   KC.F9,   KC.F10,  KC.F11,  KC.F12,
+        KC.GRV, KC.EXLM,  KC.AT,   KC.HASH, KC.DLR,  KC.PERC,                   KC.CIRC, KC.AMPR, KC.ASTR, KC.LPRN, KC.RPRN, KC.TILD,
+        _______, _______, _______, _______, _______, _______, _______, _______, XXXXXXX, KC.UNDS, KC.PLUS, KC.LCBR, KC.RCBR, KC.PIPE,
+                                   _______, _______, _______, _______, _______, _______, _______, _______
+    ],
+    [  #RAISE
+        KC.GRV, KC.N1,   KC.N2,   KC.N3,   KC.N4,   KC.N5,                       KC.N6,   KC.N7,   KC.N8,   KC.N9,   KC.N0,   _______,
+        KC.F1,  KC.F2,   KC.F3,   KC.F4,   KC.F5,   KC.F6,                       XXXXXXX, KC.LEFT, KC.DOWN, KC.UP,   KC.RGHT, XXXXXXX,
+        KC.F7,  KC.F8,   KC.F9,   KC.F10,  KC.F11,  KC.F12,   _______, _______,  KC.PLUS, KC.MINS, KC.EQL,  KC.LBRC, KC.RBRC, KC.BSLS,
+                                  _______, _______, _______,  _______, _______,  _______, _______, _______
+    ]
+]
+
+if __name__ == '__main__':
+    keyboard.go()