None of the in-built theme layouts (e.g. base, login, maintenance, etc...) have precisely what I want for my plugin pages, so I want to create my own layout.
I know I can do this in the theme itself, e.g. if I go into theme_boost I can append another layout in the config.php file, and create a new mustache template. However, I don't want to have to do this for every theme that people may be using.
Is there a way of defining the new layout, within my block plugin itself?
I thought I might be able to do something like, create a "/blocks/myblock/templates" directory, put the mustache template in there, and then instead of
using a core layout, e.g.