fix(web): handle parameter definition exceptions

[platypii]

There is a UI bug when a user provides malformed parameter definitions. An exception is thrown internally, but the UI gets stuck with the message:

processing, please wait

This PR catches exceptions thrown inside the designParameters function. If an exception is thrown, it gets added to the status object so it can be displayed to the user. After applying this PR, the user message becomes more helpful:

ERROR: Definition of choice parameter (tooling) should include a 'values' parameter

Example script:

const { cuboid } = require("@jscad/modeling").primitives

function getParameterDefinitions() {
  return [{name: "tooling", type: "choice", caption: "Tooling"}] // Oops forgot "values"
}

function main(params) {
  return cuboid({})
}
module.exports = { getParameterDefinitions, main }

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[z3dev]

@platypii This is great! So many users are still complaining about the stack traces, error messages, etc. This is going to help many many users. SUPER

[z3dev]

@platypii Thanks again. I reviewed the code, and tried the changes. This is a nice fix.