Single header generates again, some more cleanup.

Looking into properly dealing with empty lines...

I want to preserve the text's empty lines in the AST for serialization purposes (perserve formatting for gapes between definitions).
Don't want to introduce the possibility of it breaking though, so will have to ignore empty_lines in a general way (if they are in a bad spot).
Attempted to cover that by having TokArray::current() auto-skip empty lines and eat as well if the type doesn't match.

scripts/bootstrap.ci.ps1

@@ -64,6 +64,7 @@ Push-location $path_project
 		'gen.hpp', 'gen.cpp',
 		'gen_dep.hpp', 'gen_dep.cpp',
 		'gen_builder.hpp', 'gen_builder.cpp'
+		'gen_scanner.hpp', 'gen_scanner.cpp'
 	)
 	$exclude = $null