Move note lists into the target gameobjects

[jmbodisch]

The Lists for the note gameobjects are currently stored in GameController. I think it would be better to make them a public member of each target.

• This involves moving the properties out of GameController and into some prefab for note targets. If there is no prefab yet, make one.
• Adding notes to the lists will be a method of the targets now, and calls to add/remove the notes from the list will be made from the Note script.
• Notes will need to be created with knowledge of their target gameobject, so they can access the list functions. Pass the gameobject into the Initialize() function for the Notes