Better JSON parsing, simpler new type support

This MR provides much better property parsing.

• Use proper python - json - C++ types when parsing, with nlohmann::json functionality.
• nlohmann::json natively supports a richer variety of types than the previous custom-made translations: https://json.nlohmann.me/features/types/
• Supporting new types in JSON can be done by adding a to_json and from_json in case the types are not known to nlohmann::json. This MR only introduces one such conversion for type BankTypes.
• Generated json files with --write-config are now reusable as input files.
• Properties should now be supplied with their proper type in python configurations as opposed to "always string".

Closes #179 (closed)

Required for #305 (closed)

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mentioned in issue #305 (closed)

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• 6d0956c5 - Fixed formatting

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Gaudi has a very powerful parser included as part of GaudiKernel, which we already depend on even for the standalone build. Instead maintaining something separate - using json with added things where it's not sufficient - I think it would be worth a try to see if the Gaudi parsers can be used.

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• 9acec088 - Remove all to_string conversions and use nlohmann::json to dump instead.

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• 7ba390be - Fix remaining configuration issues.

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changed title from Better JSON parsing, ease to support new types in properties. to Better JSON parsing, simpler new type support

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assigned to @msaur

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• 7ba390be...0b12a15d - 14 commits from branch master
• 27dd0730 - Better JSON parsing, ease to support new types in properties.
• d5a6e87c - Fixed formatting
• 20b65dc7 - Remove all to_string conversions and use nlohmann::json to dump instead.
• 068d9319 - Fix remaining configuration issues.

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/ci-test