AlwaysShowToolbar needs inline docs

[peller]

Missing overall docs to explain what the plugin is, and also some method-level summaries.

lalee points out that you can just put the Editor in a BorderContainer? and set the region of the toolbar to "top" and get the same effect, with the added feature of being able to stretch the Editor to the parent.

This plugin seems to serve two purposes: auto sizing and floating toolbar. We could break this out into two plugins, or given the above, just replace it with an autosize plugin.

[peller]

nm, lalee's idea is cool, but only works for 100% x 100% sizing. Guess we still need the floating toolbar code.