Update for ending changes

Below you can find a summary of the changes with the most recent update, which should be the final one barring small typo fixes.

• The ending segment beginning from the one called "Mentor" was modified to better present the twists and turns comprising the finale of the story. Some segments have small additions and others have larger rewrites. No segment before that one was modified as part of the ending rework.

• A certain background in the segment called "Meager" was not properly going through its animation. It has now been fixed.

• Two more typos were fixed.