Function and variable renaming for consistency and clarity

[lekevicius]

• startingPrice → auctionStartingPrice
• minimumBidStep → auctionMinimumBidStep
• minimumAuctionDuration → auctionMinimumDuration
• bidAuctionExtension → auctionBidExtension
• startTime → auctionStartTime
• endTime → auctionEndTime
• winningBid → leadingBid
• winningBidder → leadingBidder
• MAX_CLEARTEXT_LENGTH → CLEARTEXT_MAXIMUM_LENGTH
• saleRoyaltiesNumerator → royaltyNumerator
• exit() → relinquish()
• lastTriggerTime → lastInvocationTime
• triggers → invocations
• triggersCount → invocationCount
• triggerWithCleartext() → invokeWithCleartext()
• triggerWithHash() → invokeWithHash()
• recordTriggerCleartext() → recordInvocationCleartext()
• AuctionStarted(uint256 auctionStartTime, uint256 auctionEndTime)
• AuctionBid(address indexed bidder, uint256 bid)
• AuctionExtended(uint256 newAuctionEndTime)
• AuctionFinalized(address indexed winner, uint256 winningBid)
• Deposit(address indexed depositor, uint256 amount)
• Settlement(address indexed holder, address indexed beneficiary, uint256 amount)
• PriceUpdated(uint256 previousPrice, uint256 newPrice)
• Purchase(address indexed seller, address indexed buyer, uint256 price)
• Foreclosure(address indexed formerHolder, bool indexed voluntary)
• Invocation(address indexed invoker, uint256 indexed invocationId, bytes32 contentHash, uint256 timestamp)
• Response(address indexed responder, uint256 indexed invocationId, bytes32 contentHash, uint256 timestamp)
• CleartextRecorded(uint256 indexed invocationId, string cleartext)
• ResponseFlagging(address indexed flagger, uint256 indexed invocationId)
• CleartextTooLong(uint256 cleartextLength, uint256 cleartextMaxLength)
• CleartextHashMismatch(bytes32 cleartextHash, bytes32 recordedContentHash)
• InvocationNotFound(uint256 invocationId)
• ResponseNotFound(uint256 invocationId)
• ResponseExists(uint256 invocationId)
• FlaggingPeriodExpired(uint256 invocationId, uint256 currentTimeValue, uint256 timeValueLimit)
• ResponseAlreadyFlagged(uint256 invocationId)
• Unify event names as nouns
  • AuctionStart
  • AuctionExtension
  • AuctionFinalization
  • PriceUpdate
  • CleartextRecording
• Review argument names
• triggerId, other internal variables
• a trigger, to trigger in comments → an invocation, to invoke
• Orb capitalization
• issuer in comments → creator
• fixing winning, royalties in comments

---

• Note: creator is still owner() in contract, sometimes called issuer inheriting from OZ contract
• Note: orb owner is still called holder in contract and read as ownerOf(tokenId), inheriting from OZ contract