scaffold: Use checkbox to display boolean value

[Tobbe]

Previously in the scaffolded display table date/time values were wrapped in a timeTag function before displaying them, and all other values were wrapped in truncate. I made the name of that display function part of the metadata we have about components in scaffold.js, so we don't need a big if-statement in the actual template for scaffolding the table.

After that refactoring I also added a new display function for displaying boolean values using a checkbox

[thedavidprice]

Hi @Tobbe I took a quick glance at this and one question I have is regarding what (if any) issues might this cause for existing Apps with CRUD when they upgrade to use this? I don't think there would be an issue with the checkbox itself since it's new. But if the scaffold.css already exists and someone 1) upgrades and 2) generates new CRUD for a model including boolean (which won't overwrite scaffold.css), then there might be a display issue due to not having the new and improved .css. Am I thinking that through correctly?

To be clear, this is definitely not a dealbreaker. But if we can anticipate what the issues might be then I'd like to include info in the next Release Notes and/or create a Forum Topic (or just refer to this one). Make sense?

[Tobbe]

@thedavidprice Ahh, didn't realize scaffold.css wasn't updated if it already exists. I totally understand why that it the case though.

For this PR it's not a huge deal. Without the css changes, the only difference will be that the checkbox is shifted four pixels to the right (in Chrome that is. Other browsers might have other default styles).

With css changes

Without css changes

So people who update, and then generate CRUD for boolean values, will get the styling from the second image above.
And the fix, if you want to mention that, is to manually insert the css rule this PR introduces