interactive.harbor handles does not handle [&<>"'] characters well

[ghostnumber7]

Describe the bug
When using interactive.harbor() there are a few issues with the /interactive form:

• If a field description contains a < character it breaks the interfase
• If an interactive.string() value contains some combinations of '<> if breaks the interfase
• If an interactive.string() value contains some combinations of +&= the value is not saved correctly

To Reproduce

interactive.harbor()
metadataTransformRegex = interactive.string(
  description = "Metadata transform regex (Example: StreamTitle='(?<artist>[^~]*?)\\s*~(?<title>[^~]*?)\\s*~ )",
  "metadataTransformRegex", "'>oops"
)

Go to localhost:8000/interactive and see it broken

Expected behavior
HTML entities should be escaped and form should be url encoded when submitting

Version details

• Ubuntu
• 2.2.0

Install method
opam

[toots]

Fixed with 81f4bca and 113ead7