Make writing tests more convenient about vis-assert HOT 7 OPEN

Idea: if the assertion fails, display a strict visualization, but not as a Kotlin code, but a 2D grid with axis markers.

Take into account the following edge cases:

• the function's value exceeds Y axis' range - mark it with some arrow, to point the user that the function goes beyond the visualization
• for a probed X value, the function returns "not a number" (e. G. Division by 0) or +/- infinity - for now, let's treat it as an invalid function - for such value, there cannot be a valid constraint. At most, no constraint at all for this X value

Ideas on the message:

• first graph: what the user gave. Use emojis ✔️ and ❌ above the columns to mark which columns contain fulfilled assertions, and for which the assertions fail
• second graph, below: suggested minimal assertions

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An alternative idea is to produce an image for each test, showing the visualization of both the actual function and the assertions.

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Consider using:

• https://github.com/nwillc/ksvg for SVG generation
• https://github.com/holgerbrandl/kravis

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For each failed test:

• produce a SVG code
• embed the code in a URL to a tool
• the tool should take whatever is given as GET parameter, and convert it to website's content - see https://github.com/krzema12/html2url

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During working on a proof of concept, I hit "Error: URI Too Long" issue.

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A stub of a helper project: https://github.com/krzema12/PlotAssertVisualizer

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