Added a burn transition that can only be called by either tokenOwner or operator
Changed transfer transition, removed from address from the logic of the transition. Transition can now be called by either tokenOwner, approvedSpender or operator. Added the removal of approvedSpender from the tokenApprovals map when transfer is executed.
burntransition that can only be called by either tokenOwner or operatortransfertransition, removedfromaddress from the logic of the transition. Transition can now be called by either tokenOwner, approvedSpender or operator. Added the removal of approvedSpender from thetokenApprovalsmap when transfer is executed.