Bug fixes for Shader API

[lukeplowden]

Changes:
I fixed several bugs I found in the Shader API. These include:

1. The transpiler failing to wrap some non-nodes in dynamicNode(), i.e. if they were Identifiers.
2. uniformVector2(() => [val1, val2]) was broken as the previous implementation was wrapping vector uniforms into arrays.
3. Sometimes when accessing components of a binary operation we would accidentally generate something like 5.000x
4. Input structs previously would break if you changed a component such as input.color = 1. This was inconsistent with hooks which expect a built in type such as vec4.
5. I also added some more formatting to the generated code for ease of debugging.

As a note @davepagurek now that 2 and 4 above are fixed, [] as a vector constructor is now complete. Point 2 is also compatible with the current hooks and setUniform() which do take arrays to represent vecs.

[davepagurek]

Just checking, did you want to leave this in?