Version 1.3.0

Cutscene engine version 1.3.0

This update makes Cutscene engine more compatible with my Dialogue engine and there are other improvements too.

- Added volume argument to scripts cutscene_play_music & cutscene_play_sound

- Made option_objects compatible with my dialogue engine

- Made some arguments optional in the cutscene_dialogue_style & cutscene_dialogue_style_bubble scripts

- Changed changelog name: Cutscene engine changelog

- Changed help note name: Cutscene engine manual