Refactoring structure

Moving *Service to a separate package and renaming to *Operations
Extracting default implementation for ActionOperations
Fixing constructor visibility
Extracting default implementation for OrganizationOperations
Extracting default implementation for ListOperations
Extracting default implementation for ChecklistOperations
Extracting default implementation for MemberOperations
Extracting default implementation for BoardOperations
Extracting default implementation for NotificationOperations
Extracting default implementation for CardOperations
Renaming of TokenService

… to TokenOperations
Extracting default implementation for TokenOperations
Extracting TypeOperations and default implementation
Removing unused methods
Removing Trello operations from TrelloImpl by introducing delegates to *Operations
Moving createCard to ListOperations
Moving TrelloTemplate to org.trello4j.core
Removing useless TODO
Reduce visibility of Default*Operations to avoid misuse
Adding Spring and Jackson dependency

Epic: Switching from standard HttpsURLConnection and gson to
RestTemplate and Jackson