added a Utility script for sprite font creation

Utilities/GetSupportedCharacters.py

@@ -0,0 +1,45 @@
+""" 
+This script prints out a <CharacterRegions> xml element that contains efficiently calculated regions for
+all of the font's supported unicode characters. Pass the font file (not the spritefont xml) as an argument.
+This script requires FontTools. Install using: pip install fonttools 
+"""
+
+""" The amount of characters that can be missing in a sequence to still put them in one region """
+leeway = 0
+
+from fontTools.ttLib import TTFont
+from sys import argv
+
+
+def print_region(start, end):
+    print(f"  <CharacterRegion>")
+    print(f"    <Start>&#{start};</Start>")
+    print(f"    <End>&#{end};</End>")
+    print(f"  </CharacterRegion>")
+
+
+# get all supported characters and sort them
+ttf = TTFont(argv[1])
+chars = list(set(y[0] for x in ttf["cmap"].tables for y in x.cmap.items()))
+chars.sort()
+ttf.close()
+
+# split them into regions based on the leeway
+start = -1
+last = 0
+total = 0
+print("<CharacterRegions>")
+for char in chars:
+    if char - last > leeway + 1:
+        if start != -1:
+            print_region(start, last)
+            total += last - start + 1
+        start = char
+    last = char
+# print the remaining region
+print_region(start, last)
+total += last - start + 1
+print("</CharacterRegions>")
+
+print(f"The font contains {len(chars)} characters")
+print(f"The spritefont will contain {total} characters")