Merge branch 'feat/filehandling' into 'feat/part-two'

src/main/java/edu/ntnu/idatt2001/group_30/Link.java

src/main/java/edu/ntnu/idatt2001/group_30/Passage.java

src/main/java/edu/ntnu/idatt2001/group_30/Story.java

...main/java/edu/ntnu/idatt2001/group_30/actions/Action.java

...va/edu/ntnu/idatt2001/group_30/actions/ActionFactory.java

.../java/edu/ntnu/idatt2001/group_30/actions/ActionType.java

.../java/edu/ntnu/idatt2001/group_30/actions/GoldAction.java

...ava/edu/ntnu/idatt2001/group_30/actions/HealthAction.java

.../edu/ntnu/idatt2001/group_30/actions/InventoryAction.java

...java/edu/ntnu/idatt2001/group_30/actions/ScoreAction.java

...u/idatt2001/group_30/exceptions/CorruptFileException.java

...u/idatt2001/group_30/exceptions/CorruptLinkException.java

...tt2001/group_30/exceptions/InvalidExtensionException.java

...edu/ntnu/idatt2001/group_30/filehandling/FileHandler.java

...tnu/idatt2001/group_30/filehandling/StoryFileHandler.java

src/main/java/edu/ntnu/idatt2001/group_30/goals/Goal.java

src/test/java/edu/ntnu/idatt2001/group_30/StoryTest.java

...du/ntnu/idatt2001/group_30/actions/ActionFactoryTest.java

...ntnu/idatt2001/group_30/filehandling/FileHandlerTest.java

...idatt2001/group_30/filehandling/StoryFileHandlerTest.java