added a player creation to the init inside of the CampaignController. The GM is created, added to the list and selected so the entry will not be null
added a call to clear the TextLabel after adding an item. Added a call to updatePlayersItems after deleting an item from a player's backpack
added a :selected attribute to the list-cell in order to highlight which item is selected
updated ItemView
changed the removePlayerFromCampaign method to simply remove the player from the playerList
updated PlayerController to clear text after creating a player
updated FXMLs to allow you to press enter in order to create an item or player after entering the name
modified css to better display text in the choice-box