convert old core plugins to new model, re #814

.gitignore

app/controllers/activityfeed.php

app/controllers/course/forum/admin.php

app/controllers/course/forum/area.php

app/controllers/course/forum/forum_controller.php

app/controllers/course/forum/index.php

app/controllers/course/messenger.php

app/controllers/news.php

app/controllers/quickselection.php

app/routes/Forum.php

app/views/activityfeed/configuration.php

app/views/course/forum/admin/childs.php

app/views/course/forum/admin/index.php

app/views/course/forum/area/_add_area_form.php

app/views/course/forum/area/_edit_area_form.php

app/views/course/forum/area/_edit_category_form.php

app/views/course/forum/area/_js_templates.php

app/views/course/forum/area/add.php

app/views/course/forum/index/_abo_link.php

app/views/course/forum/index/_areas.php