Add batch test compile action

[delphidabbler]

Add a facility to test compile a whole selection of snippets with a single specified compiler.

Provide option to output results to a text or HTML file.

Also add facility to output results in such a way that they can be re-imported and merged with existing snippet compile results (⭐). Maybe use some kind of JSON format file that contains compiler code (not ordinal value because that can change), and for each snippet its category id, snippet id and compile result code.

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⭐ This option should be available for all snippets, but the merge option should apply only to user defined snippets. The reason for applying to read only snippets is to generate files that can update code-snippets files.