Upvote sys

[Gerard097]

• Adds Upvote Election related classes
• Adds Voter, Delegate, Head Delegate & Chief Delegate
• Adds Community Member
• Adds reward token hook to check if either sender or receiver can have a Community Member membership
• Homogenized eosio::name usage
• Add import election action
• Removed a few unused constants
• Added ifdef blocks to disable modules with defined macros