AVM Transaction class

The avm_transaction base class is the basis for all transaction objects
Requires the user to define transaction-specific methods called by other components
convert2string(): generate a string that gets displayed by print()
clone(): defines the action to be performed when copying the transaction (handle-only, shallow copy, deep copy, etc.)
comp(): defines which fields are relevant when comparing two transaction
clone() and comp() methods are used by other AVM
components to handle the transaction correctly

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