feat: add character generator using orao ROM

orao/chargen.py

@@ -0,0 +1,22 @@
+
+chars = None
+
+def chargen_init(char_data):
+	global chars
+	chars = char_data
+
+
+def chargen_draw_char(surf, px, py, ch):
+	char_loc = (ord(ch) - 32) * 8
+	for y in range(8):
+		c = chars[char_loc + y]
+		for x in range(8):
+			if (c >> x) & 1:
+				surf.set_at((px + x, py + y), (0, 255, 0))
+			else:
+				surf.set_at((px + x, py + y), (0, 0, 0))
+
+
+def chargen_draw_str(surf, px, py, str):
+	for x in range(len(str)):
+		chargen_draw_char(surf, px + x * 8, py, str[x])