Fix some migration headers and add chapter value for campaigns.

...eandmystics/miceandmystics/MiceAndMysticsApplication.java

...yecreate/miceandmystics/miceandmystics/RealmMigrator.java

...yecreate/miceandmystics/miceandmystics/model/Ability.java

...eate/miceandmystics/miceandmystics/model/Achievement.java

...ate/miceandmystics/miceandmystics/model/BackpackItem.java

...ecreate/miceandmystics/miceandmystics/model/Campaign.java

...create/miceandmystics/miceandmystics/model/Character.java

...eyecreate/miceandmystics/miceandmystics/model/Player.java

.../miceandmystics/viewholders/CampaignHeaderViewHolder.java

...sticsTracker/src/main/res/layout/item_campaign_header.xml

MiceAndMysticsTracker/src/main/res/values/strings.xml