Refactor logic for scaling nodes

[d2fong]

Nodes are scaled based on whether they are a multimer, or have state/infos. Ideally these should act as functional transforms on the shape arguments instead of a sequence of if statements.

Cases that also need to be handled:

• scale size based on the number of state/infos

[d2fong]

Determine node width deterministically without using / reading / setting node.width()

Create a function in element.js:dimensions, that does the following:
w0 = Compute sum total width of all state vars based on length of each label
w1 = Computer sum total width of all units of information based on length of each label
wN = width of node = max(w0, w1)

This function will be used to deterministically compute how wide the node needs to be to accommodate each state var / unit of information and will set the node width before drawing any aux items.

Once width is set, draw each aux item without worrying about width overflow