* [LTR] Implement Barrow-Blade
* Took ideas from Wooden Stake, Humble and Shadowspear
* Play tested effects
* Simpler constructor for equip
* Revamped BlocksOrBlockedAttachedTriggeredAbility
* New logic in `BlocksOrBlockedAttachedTriggeredAbility`
* Changed `Ferocity` and `Gift Of The Woods`
* Removed custom class from `Barrow Blade`
* New class, revert changes in cards
* Added the new class `BlocksOrBlockedByCreatureAttachedTriggeredAbility()`
* Reverted changes to `BlocksOrBlockedAttachedTriggeredAbility()` but including `AttachmentType` in constructor
* Reverted changes to `Ferocity` and `GiftOfTheWoods`
* Changed `Barrow-Blade` to use `BlocksOrBlockedByCreatureAttachedTriggeredAbility()`
* Added a few comments
* Tried optimizing the IF statements in the new class but whenever I tried some condition would stop working, accepting suggestions
* Null check added
* Added a null check for game.getPermanent(sourceId)
* Changed checks to the top to avoid unnecessary processing when encountering any null variable
* Removed unnecessary import
