Reduce local/moodlecheck errors.

action.php

backup/moodle2/restore_pdfannotator_activity_task.class.php

classes/output/answermenu.php

classes/output/reportmenu.php

classes/output/statistics.php

classes/privacy/provider.php

constants.php

controller.php

db/access.php

db/install.php

db/messages.php

db/upgrade.php

lang/en/pdfannotator.php

lib.php

locallib.php

model/annotation.class.php

model/comment.class.php

model/pdfannotator.php

model/statistics.class.php

renderer.php