added non-functional manager buttons to scheduleView shift popup (edit / remove shift)

...pp/src/main/java/com/example/schedulerapp/Controller.java

...App/src/main/java/com/example/schedulerapp/DailyView.java

...ulerApp/src/main/java/com/example/schedulerapp/Model.java

.../src/main/java/com/example/schedulerapp/ScheduleView.java

...pp/src/main/java/com/example/schedulerapp/WeeklyView.java

.../target/classes/com/example/schedulerapp/Controller.class

...erApp/target/classes/com/example/schedulerapp/Model.class

...arget/classes/com/example/schedulerapp/ScheduleView.class