Fix bad JSON strings in feature properties

[nf-s]

Fix bad JSON strings in feature properties

• Fix getFeatureProperties (in FeatureInfoSection) failing due to bad JSON parsing of nested strings.
• The TableFeatureInfoStratum default featureInfoTemplate will now not show _id_ (internal Terria feature ID) in feature info

Test me

• Before
• After
• Click on feature
• Before you will see "Some Bad Json" and "Id" but they will both be empty
• After you will see "Some Bad Json" = "{Hello}"

Checklist

• There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• I've updated relevant documentation in doc/.
• I've updated CHANGES.md with what I changed.
• I've provided instructions in the PR description on how to test this PR.