[nigeltao]

Handsum is intrinsically 16x16. Decoding to 32x32 is a two step process:

1. Decode to 16x16. This is done by the Handsum library.

2. Upscale 2x. This is done by the caller of the Handsum library (or, for the Wasm demo, by the HTML renderer).

If you want 48x48 or 64x64, just raise the 2x, in step 2, to 3x or 4x.