Minor fixes

[Metritutus]

• Updated buildCarrier() method in StarUpgradeService to validate that the carrier is being built with a whole number of ships.
• Removed ownedByPlayer property from MapObject. Replaced with dynamic value resolution in the client for the tables that used this property for sorting.
• Added the ability to end user impersonation.
• Added new sessionService.
• Updated SessionData interface to include other properties that are already being used in uses of SessionData.
• Updated numerous areas that would adjust data that was also stored in user sessions to also update that user's sessions so that the data is aligned.
• Updated listUsers() method in AdminService to query the database for the user's roles rather than using their session data.
• Updated setCredits() method in UserService to return the amount of credits set.
• Updated Users component:
  • Updated to show/hide certain settings based on the user's roles.
  • Updated to update the current administrator user's credits/roles in their local session if they are adjusting themselves.
  • Updated Deduct Credits button to only show if that user has more than 0 credits.
• Updated Admin controller:
  • Updated setCredits() method to return the amount of credits after the operation.
  • Added validation to banUser() method to prevent the user from banning themselves (including if they are impersonating another user).
  • Added validation to impersonate() method to prevent the user from impersonating themselves, or trying to impersonate another user while they are already impersonating a user.
• Updated AddWarning component:
  • Updated button to use btn-success CSS class instead of btn-default.
  • Slightly improved layout.
  • Updated layout for narrow screen sizes (eg mobile screens).