Attempt to add letter scores for small kanji letters.

According to this wiki page:

> Modified letters with the diacritics ゛ and ゜ , as well as the
small letters (ぁぃぅぇぉっゃゅょゎ) are played as if
they were not modified.

So, with zero knowledge of Kanji, I tried to find the corresponding
letters that looked like these small letters, and put these small
letters next to the larger versions with the same score.

libraries/trie/src/main/java/com/serwylo/lexica/lang/Japanese.java

@@ -12,7 +12,9 @@ public class Japanese extends Language {
         // These point values are from an "unofficial Japanese Hiragana Scrabble set" according to
         // wikipedia: https://en.wikipedia.org/wiki/Scrabble_letter_distributions#Japanese_Hiragana
         letterPoints.put("い", 1);
+        letterPoints.put("ぃ", 1);
         letterPoints.put("う", 1);
+        letterPoints.put("ぅ", 1);
         letterPoints.put("か", 1);
         letterPoints.put("し", 1);
         letterPoints.put("た", 1);
@@ -25,20 +27,24 @@ public class Japanese extends Language {
         letterPoints.put("く", 2);
         letterPoints.put("こ", 2);
         letterPoints.put("つ", 2);
+        letterPoints.put("っ", 2);
         letterPoints.put("な", 2);
         letterPoints.put("に", 2);
         letterPoints.put("は", 2);
         letterPoints.put("よ", 2);
+        letterPoints.put("ょ", 2);
         letterPoints.put("れ", 2);
 
         letterPoints.put("あ", 3);
+        letterPoints.put("ぁ", 3);
         letterPoints.put("け", 3);
         letterPoints.put("す", 3);
         letterPoints.put("せ", 3);
         letterPoints.put("も", 3);
         letterPoints.put("り", 3);
         letterPoints.put("る", 3);
         letterPoints.put("わ", 3);
+        letterPoints.put("ゎ", 3);
         letterPoints.put("ら", 3);
 
         letterPoints.put("さ", 4);
@@ -47,15 +53,19 @@ public class Japanese extends Language {
         letterPoints.put("ま", 4);
 
         letterPoints.put("お", 5);
+        letterPoints.put("ぉ", 5);
         letterPoints.put("ひ", 5);
         letterPoints.put("ふ", 5);
         letterPoints.put("ゆ", 5);
+        letterPoints.put("ゅ", 5);
 
         letterPoints.put("ほ", 6);
         letterPoints.put("め", 6);
         letterPoints.put("や", 6);
+        letterPoints.put("ゃ", 6);
 
         letterPoints.put("え", 8);
+        letterPoints.put("ぇ", 8);
         letterPoints.put("へ", 8);
         letterPoints.put("み", 8);
 
@@ -67,20 +77,11 @@ public class Japanese extends Language {
 
         // All the tiles below were not directly listed in the wikipedia article. But rather, they
         // are variations of the above with diacritics added (and perhaps other variations?).
-        letterPoints.put("ゃ", 1);
-        letterPoints.put("ゅ", 1);
-        letterPoints.put("ょ", 1);
-        letterPoints.put("ゎ", 1);
         letterPoints.put("ゐ", 1);
         letterPoints.put("ゑ", 1);
         letterPoints.put("を", 1);
         letterPoints.put("ゔ", 1);
         letterPoints.put("〜", 1);
-        letterPoints.put("ぁ", 1);
-        letterPoints.put("ぃ", 1);
-        letterPoints.put("ぅ", 1);
-        letterPoints.put("ぇ", 1);
-        letterPoints.put("ぉ", 1);
         letterPoints.put("が", 1);
         letterPoints.put("ぎ", 1);
         letterPoints.put("ぐ", 1);
@@ -93,7 +94,6 @@ public class Japanese extends Language {
         letterPoints.put("ぞ", 1);
         letterPoints.put("だ", 1);
         letterPoints.put("ぢ", 1);
-        letterPoints.put("っ", 1);
         letterPoints.put("づ", 1);
         letterPoints.put("で", 1);
         letterPoints.put("ど", 1);