Purpose

addresses part of https://jira.autodesk.com/browse/DYN-5506

• adds better error messages for ZT import by keeping track of what type and member we are trying to import / parse when an exception or validity check fails.
• improves the UI a bit for dll import failure
• fix a bug in custom text control ... overly aggressive modification of text content.

There are a lot of whitespace changes because I added some giant try/catch statements - please review with white space diff off.

TODO

• tests

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

(FILL ME IN) Brief description of the fix / enhancement. Mandatory section

Reviewers

(FILL ME IN) Reviewer 1 (If possible, assign the Reviewer for the PR)

(FILL ME IN, optional) Any additional notes to reviewers or testers.

FYIs

(FILL ME IN, Optional) Names of anyone else you wish to be notified of