rendered text in place of a picture

[jsnkuhn]

In trying to recreate the Link's Awakening windfish tracker (http://windfish.io/windfish/) it occurs to me it would be useful to have the ability to have RandoTracker render text in place of an image in a picture tag.

Windfish has 2 different use cases for this:

1. the dungeon #'s and the entrance letters. These are just individual center #s or letters being used as/in the place of pictures

2. the numbers in the bottom right corner of the instrument icons are used in addition to a picture

Both of these are doable with actual images but having the text rendered by randoTracker would be considerably less time consuming.