[qmk#4]

enlarge code:
* enlarge keymap.c file with the following content:
    * implement process_record_user function for magement of the following cases:
        * backlighting levels,
        * breathing backlighting levels,
        * DICTAD dictate on/off,
    * implement global variables for CAPS and BREATHING,
    * enum general tap dance states,
    * implement general purpose tap dance function for the management of all cases (SINGLE_TAP, SINGLE_HOLD, …)
    * implement tap dance keys for *GHKN layer,
        * Q: SUSR, TAB, BLIT,
        * W: MOUS,
        * R: RESET, APPS,
        * U: DIAERESIS, APPS,
        * I: CIRCUMFLEX,
        * P: SUSR,
        * A: CAPS_LOCK, L_SHIFT,
        * F: CAPS_LOCK, L_COMMAND,
        * J: ACUTE ACCENT,  GRAVE ACCENT, L_COMMAND
        * B: NMBR,
        * N: NMBR, TILDE FOR Ñ,
    * implement tap dance keys for *SYMB layer,
        * Y: BACKSLASH, CIRCUMFLEX,
        * A: QUOTE, DOUBLE QUOTE,
        * G: DOLLAR, EURO,
        * Z: EXCLAMATION MARK, INVERTED EXCLAMATION MARK,
        * X: QUESTION MARK, INVERTED QUESTION MARK,
    * implement tap dance keys for *NMBR layer,
        * A: triple zero, KC_SPC,
        * S: double zero, KC_DEL,
        * B: exit *NMBR layer, KC_PDOT,
        * N: exit *NMBR layer, KC_PSLS,
    * implement tap dance keys for *SUSR layer,
        * R: RESET keyboard,
        * W: LOGOUT,
        * A: MENU BAR / SLEEP,
        * S: DOCK BAR / KILL MENU,
        * D: TOOLS BAR / KILL CURRENT APPLICATION,
        * F: STATUS BAR / SHUT DOWN,
        * G: FLOATING WINDOW / RESTART,