[Keymap] ISO keymap for TADA68 with programming in mind (#6597)

* Layout with better use of navigation keys

* Update keyboards/tada68/keymaps/onelivesleft/config.h

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

keyboards/tada68/keymaps/onelivesleft/config.h

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+#pragma once
+
+#define BACKLIGHT_BREATHING
+#define BREATHING_PERIOD 6

keyboards/tada68/keymaps/onelivesleft/keymap.c

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+#include QMK_KEYBOARD_H
+
+#define _BL 0
+#define _FL 1
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  /* Keymap _BL: (Base Layer) Default Layer
+   * ,----------------------------------------------------------------.
+   * |Esc | 1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|Backsp |Del |
+   * |----------------------------------------------------------------|
+   * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|     |CAPS|
+   * |-------------------------------------------------------    -----|
+   * |FN     |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;| '|  #|Entr|Home|
+   * |----------------------------------------------------------------|
+   * |Shift|  \ |  Z|  X|  C|  V|  B|  N|  M|  ,|  .| /|Rshift|Up|End|
+   * |----------------------------------------------------------------|
+   * |Ctrl|Win |Alt |        Space          |Alt| FN|Ctrl|Lef|Dow|Rig |
+   * `----------------------------------------------------------------'
+   */
+  [_BL] = LAYOUT_iso(
+    KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC, KC_DEL,  \
+    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC,          KC_CAPS, \
+    MO(_FL), KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,  KC_HOME, \
+    KC_LSFT, KC_NUBS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT, KC_UP,   KC_END,  \
+    KC_LCTL, KC_LGUI, KC_LALT,                   KC_SPC,                             KC_RALT, MO(_FL), KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
+	),
+
+  /* Keymap _FL1: Function Layer 1
+   * ,----------------------------------------------------------------.
+   * |   | F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12| Delete| Ins|
+   * |----------------------------------------------------------------|
+   * |     |   | ↑ |   |   |   |   |   |   |   | Prnt |  |  |   |Break|
+   * |-------------------------------------------------------    -----|
+   * |     | ← | ↓ | → |   |   |   |   |   |   |   | ` |   |     |PgUp|
+   * |----------------------------------------------------------------|
+   * |     |   |   |   | L+|LED| L-|   | Mut|  V-|V+|  | MsBtn|Up|PgDn|
+   * |----------------------------------------------------------------|
+   * |    |    |    |                       |   |   |MsBn| Lt| Dn| Rt |
+   * `----------------------------------------------------------------'
+   */
+  [_FL] = LAYOUT_iso(
+    _______, 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_DEL,  KC_INS,  \
+    _______, _______, KC_UP,   _______, _______, _______, _______, _______, _______, _______, KC_PSCR, _______, _______,          KC_BRK,  \
+    _______, KC_LEFT, KC_DOWN, KC_RGHT, _______, _______, _______, _______, _______, _______, _______, KC_GRV,  _______, _______, KC_PGUP, \
+    _______, _______, _______, _______, BL_DEC,  BL_TOGG, BL_INC,  _______, KC_MUTE, KC_VOLD, KC_VOLU, _______, KC_BTN2, KC_MS_U, KC_PGDN, \
+    _______, _______, _______,                   _______,                            _______, _______, KC_BTN1, KC_MS_L, KC_MS_D, KC_MS_R
+	),
+};

keyboards/tada68/keymaps/onelivesleft/readme.md

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+# onelivesleft TADA68 layout for ISO UK
+
+This is a layout designed with programming in mind.  It's a modification of the `iso-uk` layout, and has been tested on a TADA68 purchased from kbdfans in May 2019. The physical key layout includes the "double height" iso Enter key and the "short" Left Shift along side the iso Backslash key. [See this keyboard-layout-editor.com Gist](http://www.keyboard-layout-editor.com/#/gists/acf0f32f7ea0d0ed35c901663ca47919)
+
+## Layout features:
+
+### Navigation column, from top-right down
+
+Bare:
+* Delete
+* Capslock
+* Home
+* End
+
+With FN:
+* Insert
+* Break
+* Page Up
+* Page Down
+
+### Mouse
+* Fn + cursors to move
+* Fn + Right Ctrl for left click
+* Fn + Right Shift for right click
+
+### Misc
+* Capslock key used as a second Fn key (for easy one-handed alt+F4 etc.)
+* Fn + ': `
+* Fn + P: Printscreen
+
+
+## Installation
+
+Please see the [tada68 readme](../../readme.md) using the following command
+
+```
+make tada68:onelivesleft:flashbin
+```

keyboards/tada68/keymaps/onelivesleft/rules.mk

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+# Build Options
+#   change to "no" to disable the options, or define them in the Makefile in 
+#   the appropriate keymap folder that will get included automatically
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = yes       # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
+CONSOLE_ENABLE = no         # Console for debug(+400)
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+NKRO_ENABLE = yes           # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = yes       # Enable keyboard backlight functionality
+MIDI_ENABLE = no            # MIDI controls
+AUDIO_ENABLE = no           # Audio output on port C6
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight. 
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+