Create Invigilator Course view
让我轻轻地告诉你，examview和server交互成功！
Invigilator Course View
Merge branch 'Invigilator-CourseView' into develop

Conflicts:
	invigilator/src/main/java/studymaster/invigilator/Configure.java
Revert "Merge branch 'Invigilator-CourseView' into develop"

This reverts commit 417bdd6028ebb967f98b0e5a12d4454984996f97, reversing
changes made to 5a6aca2965759d4bb87d2505b898bdfb2511e55e.
delete temp files
Merge branch 'Invigilator-CourseView' into develop
invigilator course view
courseview
invigilator course view2
modify css
Add video setting to App.java in examinee
Audio Client implements
invigilateView
change ignore
retain and release design in Connector
refactor codes
fix runLater bug
update css
Deal with login failed.