Adds vnResearch.js for implement custom researches

This commit adds a new file "nvResearch.js" for implement custom researches.
Now Visual Novel Mod adds support for Researches.
Adds new research: "Auto Save".
Adds new research: "Quick Saving"
Change Auto Saving attributes
Adds new research: 'Translations'
Adds call to vnResearch.addResearch to main file.