bernardo/gradeimporter: Moodle plugin to facilitate exams/exercises feedback disponibilization to students @ gradebook

Bernardo 8a382b7342 feat: Submission removal correctly updates grade in gradebook		%!s(int64=2) %!d(string=hai) anos
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locallib.php	fa8449143b Add edit mode for gradeimporter:	%!s(int64=2) %!d(string=hai) anos
student_viewlib.php	f65f0a81a5 Gradebook update	%!s(int64=2) %!d(string=hai) anos
teacher_viewlib.php	8a382b7342 feat: Submission removal correctly updates grade in gradebook	%!s(int64=2) %!d(string=hai) anos
testlib.php	ed948877b6 Code Quality:	%!s(int64=2) %!d(string=hai) anos