Load `Many` forms properly, fix date fields

[randm-ch]

• Fix a regression of regex fields where they didn't load the value when set was called
• Refrain from using xmap since they cause an error on validation, e.g. Uncaught org.scalajs.linker.runtime.UndefinedBehaviorError: java.lang.ClassCastException: 0 is not an instance of java.lang.Integer
• Remove debug log
• Fix dateTime parsing and setting (required without nano/second)
• Set the count field value for Many form fields when form value is set
• Add a short delay when loading values for Many form fields since variables.now() may not be up to date yet after updating the count field

[kitlangton]

Hey! Thank you again! You're kicking butt. At this rate, this'll be a bona fide useful library 😄