InventoryTransaction::execute() now throws exceptions instead of returning true/false

src/inventory/transaction/TransactionValidationException.php

@@ -23,6 +23,9 @@ declare(strict_types=1);
 
 namespace pocketmine\inventory\transaction;
 
-class TransactionValidationException extends \RuntimeException{
+/**
+ * Thrown when a transaction cannot proceed due to preconditions not being met (e.g. transaction doesn't balance).
+ */
+class TransactionValidationException extends TransactionException{
 
 }