* Add AMMID to AMM root account
* Remove owner dir entry for ltAMM

…ss reviewer's feedback

* Limit number of trustlines to delete on final withdraw and AMMDelete
* Enable AMM in empty state when LPTokens is 0 in final withdraw
* Disallow trustlines to AMM in empty state
* Add utility functions to delete nodes on AccountDelete and AMM account delete
* Add tfTwoAssetIfEmpty deposit option in AMM empty state
* Fail all AMM transactions in AMM empty state except special deposit
* Add tecINCOMPLETE to indicate not all AMM trustlines are deleted; handle it in Transactor similar to deleted offers
* Extend the unit-tests

…ddressing reviewer's feedback

* AMMWithdraw deletes AMM trustlines and AMM account/object only if number of trustlines is less than max
* Add tecAMM_NOT_EMPTY to flag cases that expect AMM in empty state
* Don't validate for invalid asset pair in AMMDelete
* Use Sandbox instead of ApplyView in some utility functions
* Other minor refactoring

…nor fixes

* Rollback AMM handling in clawback transactor
* Use tecINCOMPLETE as indicator of partial deletion in cleanupOnAccountDelete() and deleteAMMTrustLines()
* Return tecINTERNAL if AMM root account is nullptr in deleteAMMAccount()
* Enable partial trustline deletion in AMMWithdraw
* Refactor AccountRootsNotDeleted::finalize()
* Refactor SetTrust::preclaim()

* Add const ammID_ to AMM jtx class
* Update changelog
* Add testcase name

…ted if OwnerPaysFeature is enabled.