Add formspec rendering automated testing #8615
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This implements unit testing of formspec rendering by using the mainmenu to render formspecs. It adds core.take_screenshot and core.on_step to the main menu API. The former is used to create images of the GUI, and the latter is used to interact with the render step.
The aim of this PR is to make PRs like #8524 and #7970 less risky.
To do
How to test
Todo