Add utility strings, update game state with drone count and points calculation.

utility/utility_strings.gd

@@ -0,0 +1,37 @@
+class_name StringUtilities extends Node
+
+func seconds_to_hms(seconds: float) -> String:
+	var ms = fmod(seconds, 1) * 100
+	var s = fmod(seconds, 60)
+	var m = fmod(seconds, 3600) / 60
+
+	var formatted : String = "%02d:%02d:%02d" % [m, s, ms]
+
+	return formatted
+
+####
+## Formats the given number with commas every 3 digits.	
+####
+func format_number(number: int) -> String:
+	# Handle negative numbers by adding the "minus" sign in advance, as we discard it
+	# when looping over the number.
+	var formatted_number := "-" if sign(number) == -1 else ""
+	var index := 0
+	var number_string := str(abs(number))
+
+	for digit in number_string:
+		formatted_number += digit
+        
+		var counter := number_string.length() - index
+        
+		# Don't add a comma at the end of the number, but add a comma every 3 digits
+		# (taking into account the number's length).
+		if counter >= 2 and counter % 3 == 1:
+			formatted_number += ","
+            
+		index += 1
+    
+	return formatted_number
+
+func float_to_percentage(value: float) -> String:
+	return "%d%%" % int(value * 100)