This is a techincal committee proposal whose proposer address (F2i6trfXqFknbgB3d9wcd1X98WWdLLktmFtK8Beud75bjTW) is shown in on-chain info below. Only this user can edit this description and the title. If you own this account, login and tell us more about your proposal.

Swap a parachain with another parachain or parathread.

The origin must be Root, the `para` owner, or the `para` itself.

The swap will happen only if there is already an opposite swap pending. If there is not,
the swap will be stored in the pending swaps map, ready for a later confirmatory swap.

The `ParaId`s remain mapped to the same head data and code so external code can rely on
`ParaId` to be a long-term identifier of a notional "parachain". However, their
scheduling info (i.e. whether they're a parathread or parachain), auction information
and the auction deposit are switched.

#192 Swap para lease between 2003 and 2000