Code tidy.

cli/castextcompiler.php

doc/en/Authoring/Question_blocks.md

lang/en/qtype_stack.php

lang/multilang.php

question.php

questiontype.php

renderer.php

stack/cas/ast.container.silent.class.php

stack/cas/castext2/block.interface.php

stack/cas/castext2/blocks/castext.block.php

stack/cas/castext2/blocks/comment.block.php

stack/cas/castext2/blocks/commonstring.block.php

stack/cas/castext2/blocks/debug.block.php

stack/cas/castext2/blocks/define.block.php

stack/cas/castext2/blocks/demarkdown.block.php

stack/cas/castext2/blocks/demoodle.block.php

stack/cas/castext2/blocks/escape.block.php

stack/cas/castext2/blocks/foreach.block.php

stack/cas/castext2/blocks/htmlformat.block.php

stack/cas/castext2/blocks/if.block.php