Add in player management and improve use interaction cases.

MiceAndMysticsTracker/src/main/AndroidManifest.xml

...iceandmystics/miceandmystics/CampaignDetailsActivity.java

.../miceandmystics/miceandmystics/PlayerManagerActivity.java

...mystics/miceandmystics/adapters/PlayerManagerAdapter.java

...dmystics/miceandmystics/viewholders/PlayerViewHolder.java

MiceAndMysticsTracker/src/main/res/layout/item_player.xml

...ysticsTracker/src/main/res/menu/menu_campaign_details.xml

...dMysticsTracker/src/main/res/menu/menu_player_manager.xml

...racker/src/main/res/mipmap-xxhdpi/ic_menu_friendslist.png

...ysticsTracker/src/main/res/mipmap-xxhdpi/ic_menu_star.png