This pull request is mainly to fix the "centered-dialog" component, but I also made a couple other changes/fixes as well.

New:

• Added a "stopTyping" method so that the stop typing functionality can be used for any instance of a type-writer.
• Added an "ignore" state key that functions as a feature and fix for "string" properties on custom type-writer components and the centered-dialog component.
• Added a "goBack" method that functions in the exact same way as the custom function for returning to the main-menu or game-screen. (The reason for this addition was so that the screen return method could be exposed to the developer. This is extremely helpful for developers creating a controller compatible version of their game)

Changes:

• The "shouldProceed" method inside of the Dialog action now uses the "stopTyping" function.
• The "open-screen" listener now uses the "showScreen" function, instead of a custom function, since both "showScreen" and the custom function did the exact same thing.

Fixed:

• Fixed a bug in the Dialog action that caused the "centered" speaker to be completely broken.
• Fixed an error in the JavaScript linting that was checking for "windows" when it should have been checking for "unix".
• Fixed a bug that was causing "instance" custom actions to not function properly.
• Fixed the "delay" property when creating a custom type-writer component.
• Fixed a grammatical error in two comments.