Combines info and note nodes

Since info & note nodes were basically the same thing, I've combined them. It also has the additional function of being able to pick which image you want displayed (if any). Nodes which were already info nodes still don't have images, those which were note nodes currently display the note image, though a simple change in the tmx can change that. How about special images for instructions (maybe a small sign with an exclamation point on it) or a recipe book for the instructions in the potions lab?

Anyone think we should also have the option of one time notes or picking potion recipes up and being able to view them elsewhere? Any other functionality?