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)