fix: stops negative numbers being interpreted as strings (#511)

Co-authored-by: Balloonpopper <balloonpopper@git.com>

addons/escoria-core/game/core-scripts/utils/esc_utils.gd

@@ -43,9 +43,9 @@ func get_typed_value(value: String, type_hint = []):
 	var regex_bool = RegEx.new()
 	regex_bool.compile("^true|false$")
 	var regex_float = RegEx.new()
-	regex_float.compile("^[0-9]+\\.[0-9]+$")
+	regex_float.compile("^-?[0-9]+\\.[0-9]+$")
 	var regex_int = RegEx.new()
-	regex_int.compile("^[0-9]+$")
+	regex_int.compile("^-?[0-9]+$")
 
 	if regex_float.search(value):
 		return float(value)