Module migrations

Storage migrations for the Staking pallet. The changelog for this is maintained at CHANGELOG.md.

Modules

v11

v12

v13

v14

Migration of era exposure storage items to paged exposures. Changelog: v14.

v15

Migrating OffendingValidators from Vec<(u32, bool)> to Vec<u32>

v16

Migrating DisabledValidators from Vec<u32> to Vec<(u32, OffenceSeverity)> to track offense severity for re-enabling purposes.

v17

Supports the migration of Validator Disabling from pallet-staking to pallet-session