Fix regression with HasImport
/HasExample
data fields, and (finally) document template data fields
#162
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This is a regression from #155: unfortunately the logic didn't check that the file where an example/import was expected, actually existed.
Additionally, given I had to spend time figuring out a bit more how those data fields are populated, I caught the opportunity to finally document the data fields.
As a bonus, I added 3 template functions that were very low hanging fruits:
lower
,upper
andtitle
.