Add ISO keymap(issue #35) and use new keymap API

converter/adb_usb/keymap_iso.c

@@ -0,0 +1,16 @@
+#include "keymap_common.h"
+
+
+const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    KEYMAP_EXT_ISO(
+    ESC, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12,           PSCR,SLCK,PAUS,                   PWR,
+    GRV, 1,   2,   3,   4,   5,   6,   7,   8,   9,   0,   MINS,EQL, BSPC,     INS, HOME,PGUP,    NLCK,PEQL,PSLS,PAST,
+    TAB, Q,   W,   E,   R,   T,   Y,   U,   I,   O,   P,   LBRC,RBRC,ENT,      DEL, END, PGDN,    P7,  P8,  P9,  PMNS,
+    LCAP,A,   S,   D,   F,   G,   H,   J,   K,   L,   SCLN,QUOT,NUHS,                             P4,  P5,  P6,  PPLS,
+    LSFT,NUBS,Z,   X,   C,   V,   B,   N,   M,   COMM,DOT, SLSH,     RSFT,          UP,           P1,  P2,  P3,
+    LCTL,LALT,LGUI,          SPC,                               RALT,RCTL,     LEFT,DOWN,RGHT,    P0,       PDOT,PENT
+    ),
+};
+
+const uint16_t PROGMEM fn_actions[] = {
+};