All tests should now be passing
use elements, not a cheaty render call
some missed bake tag replacements
remove the log statement for missing templates

it's useful whilst developing this feature, but probably not otherwise
phpcs fixes
add tests demonstrating newline handling works
swallow leading whitespace before template tags

this makes it easier to write templates without introducing, or needing
to think about, leaving leading whitespace lying arounswallow leading
whitespace before template tags

this makes it easier to write templates without introducing, or needing
to think about, leaving leading whitespace lying aroundd
Warn when no template exists.

It's a normal scenario to try and render a template and for it not to
exist; don't die/fail but do warn the user that no template was found
don't leave the pre-processed template lying around

It might be useful for debugging whilst writing templates though...
doc blocks for test functions