More tests for regular subroutine folding
Add the ability to name fold tests
Add names for basic folding tests
Test print { $fh } ... with folding
Make sure print { $fh } doesn't prematurely end sub folds
Mark folds on heredoc
Strip fold comments from example fold code

This way, we can mark up expected folds where such a comment would
be illegal; for example, after the end of a heredoc
Add syntax test for multi-line regexes with braces
Add folding tests for closing braces in strings
Make it easier to test quote words with closing brace
Make sure closing braces in quote forms don't interfere with folding
Name anonymous sub + next line test
Fix nesting of braces in [...] in regexes
Mark unfinished tests as TODO
Add test for folding an anonymous sub in a regular one
Allow nested subs to fold properly
Prevent characters in comments from closing folds
Add tests for @{...} and %{...} folding in subs
Don't allow @{...} and friends to interfere with sub folds
Add test for BEGIN blocks and folding