updated contents from Atlas repo

strings-bytes/plane_count.py

@@ -0,0 +1,16 @@
+import sys
+from unicodedata import name, normalize
+
+total_count = 0
+bmp_count = 0
+
+for i in range(sys.maxunicode):
+    char = chr(i)
+    char_name = name(char, None)
+    if char_name is None:
+        continue
+    total_count += 1
+    if i <= 0xffff:
+        bmp_count += 1
+
+print(total_count, bmp_count, bmp_count/total_count, bmp_count/total_count*100)