refactor more vue apps

app/controllers/admin/tree.php

app/controllers/search/courses.php

app/views/admin/tree/batch_assign_semtree.php

app/views/admin/tree/rangetree.php

app/views/admin/tree/semtree.php

app/views/search/courses/index.php

lib/classes/VueApp.php

...ces/assets/javascripts/bootstrap/responsive-navigation.js

resources/assets/javascripts/bootstrap/treeview.js

resources/assets/javascripts/bootstrap/vue.js

resources/assets/javascripts/entry-base.js

templates/header.php