data(kana): Mozc's romaji table

hira.map and kata.map knew 152 keys of the 320 every Japanese IME
accepts: no nn, no small kana by x or l (xtu, xya, la, ...), no sya, tya,
zya, jya, dya, cya, tsa, thi, dhi, twu, kye, ye, fya, wha, and zi gave ぢ.
Both are now Mozc's default table in full, kata.map in Katakana, so that
they agree (kata.map alone had di → ディ and a lone v).  With Mozc, wi
and we are うぃ and うぇ (wyi and wye the old kana), the v row is ゔ, nn
is ん, and [ ] ~ and the z-prefixed symbols type 「 」 〜 ・ … ← ↓ ↑ →.

n' is a row now, not a case in transjp.  A row whose value is っ keeps
its consonant pending only when it is a doubled consonant or tch: xtu
and ltu are っ itself, so a lone っ can finally be typed.

tests/engine_test.c

@@ -451,7 +451,7 @@ engine_commit_contract(struct ct *t)
 		return;
 	im.nkouho = 1;
 	im.sel = -1;
-	CT_CHECK(t, !keystroke('q', 0, &com));
+	CT_CHECK(t, !keystroke('!', 0, &com));
 	checkstr(t, "uneaten-key commit", "か", &com);
 	CT_EQ_INT(t, 0, im.pre.n);
 	CT_EQ_INT(t, 0, im.raw.n);
@@ -1061,7 +1061,17 @@ engine_japanese_readings(struct ct *t)
 	} cases[] = {
 		{ "nya", "にゃ" },
 		{ "n'ya", "んや" },
-		{ "nnya", "んにゃ" },
+		{ "nnya", "んや" },
+		{ "nnnya", "んにゃ" },
+		{ "konnnichiha", "こんにちは" },
+		{ "wi", "うぃ" },
+		{ "vu", "ゔ" },
+		{ "xtu", "っ" },
+		{ "axtu", "あっ" },
+		{ "lla", "っぁ" },
+		{ "matcha", "まっちゃ" },
+		{ "zi", "じ" },
+		{ "[", "「" },
 		{ "kin'youbi", "きんようび" },
 	};
 	static const struct {