Strip extraneous white space from user input

[CarlosNZ]

If users include white space at the end of their input, this can cause subsequent problems with Markdown rendering (e.g. wrapping in for italics).

So we should trim white space from all user input where possible. Places I can think of off the top of my head:

• Reviewer comments
• Reviewer overall comment
• Text input form element
• Long Text input form element
• ??

Also, might be a good idea to have a "keepWhiteSpace" property for form inputs, as we might want to allow only white space as a valid response in some situations

[CarlosNZ]

Need to also make sure this works for pre-filled elements (i.e. that have a default property)