Bad character in content type text / string value causes error on data or app export

[prichards14]

A user copy/pasted bad data from a document into a custom 2sxc App Content Type Text / string value. When attempting to export this data row or when attempting to export the App, this error is displayed:

{"Message":"Bad Request","ExceptionType":"System.ArgumentException","ExceptionMessage":"'\u0002', hexadecimal value 0x02, is an invalid character."}

Users should not be allowed to create content that breaks core 2sxc functionality. A possible fix would be to use a RegEx to detect and report or filter out all special characters that are not allowed in the database. In this specific case, the character is HEX 0x02, STX, an obsolete "Start of Text" control character.

[prichards14]

Issue added to wrong repository. See 2sic/2sxc#3286.