Penalty Class Refactoring Merge Request

See merge request !2

Adjusted codebase and previous tests to work with new Penalty class and added unit tests for new functionality

Merging First Refactoring into main

See merge request !1

Refactoring 1: Make Slot class abstract, make new classes GameSlot and PracticeSlot which extend Slot.

Initial commit with unit tests for all functionality concerning the use of the "isGameSlot" method and constructing Slot objects.

- /src/main/scheduler/model/Division.java
- /src/main/scheduler/model/Event.java
- /src/main/scheduler/model/Instance.java
- /src/main/scheduler/model/Schedule.java
- /src/main/scheduler/model/Slot.java
- /src/main/scheduler/parser/Parser.java
- /src/main/scheduler/search/BSTree.java
- /src/main/scheduler/search/GeneticAlgorithm.java
- /src/main/scheduler/search/ORTree.java
- /src/main/main.java
- /src/test/test.java

- /src
- /src/main/main.java
- /src/test/test.java