Isometric object creation tools

Asepirite has grids and pixel grids which are handy, but they are mostly limited to flat square things. It would be nice if there were tools for making isometic art easier, isometric angle grids, and perhaps a tool to generate perfect isometric shapes of arbitrary size like this one http://codepen.io/nosir/details/ganrh

Start by reviewing Aseprite's existing grid and pixel-grid tools, then compare the requested isometric grids and shape generation with the linked CodePen example. The issue does not name files, tests, or an agreed scope; completion would require defining which isometric tools and shape behaviors are supported.

Written by the indexing model from the issue text.