Rename midterm-solutions

...ams/2021-midterm-solutions/m21/project/MOOCSettings.scala

...ams/2021-midterm-solutions/m21/project/StudentTasks.scala

...exams/2021-midterm-solutions/m21/project/build.properties

...xams/2021-midterm-solutions/m21/project/buildSettings.sbt

...ious-exams/2021-midterm-solutions/m21/project/plugins.sbt

...olutions/m21/src/main/scala/m21/MultiWriterSeqCount.scala

...1-midterm-solutions/m21/src/main/scala/m21/SeqCount.scala

...1/src/main/scala/m21/instrumentation/AtomicVariable.scala

...ions/m21/src/main/scala/m21/instrumentation/Monitor.scala

...-midterm-solutions/m21/src/test/scala/m21/TestSuite.scala

...21/src/test/scala/m21/instrumentation/MockedMonitor.scala

...ns/m21/src/test/scala/m21/instrumentation/Scheduler.scala

...utions/m21/src/test/scala/m21/instrumentation/Stats.scala

...s/m21/src/test/scala/m21/instrumentation/TestHelper.scala

...ns/m21/src/test/scala/m21/instrumentation/TestUtils.scala

...-midterm-solutions/m21/src/test/scala/m21/overrides.scala

previous-exams/2021-midterm-solutions/m3.md

previous-exams/2021-midterm-solutions/m3/.gitignore

previous-exams/2021-midterm-solutions/m3/assignment.sbt

previous-exams/2021-midterm-solutions/m3/build.sbt