(maint) Ensure every file has a trailing newlines

Without this patch some files exist in the tree that don't have trailing
newlines. This is annoying because perl -pli.bak -e will automatically
add a newline to every file it modifies in place. The files that
actually have modifications by the global search and replace need to be
separated from the files that only have newlines added.

This patch simply adds newlines to everything if they don't exist on the
last line.

Yes, the PNG's are perfectly fine with a trailing newline as well.