* generate_storage_alias: Rewrite as proc macro attribute
This rewrites the `generate_storage_alias!` declarative macro as proc-macro attribute. While doing
this the name is changed to `storage_alias`. The prefix can now also be the name of a pallet. This
makes storage aliases work in migrations for all kind of chains and not just for the ones that use
predefined prefixes.
* Fix compilation and FMT
* Moare fixes
* 🤦
* ......
* Rework the syntax and support instancing
* FMT
* Prefix variants with `Storage`
* Make it compile
* Fix where clause on rust stable
* Fixed logic of the storage migration to triple reference counting. The previous behaviour made it impossible for any chain not already upgraded to dual reference counting to upgrade the runtime.
* +Removed the on_runtime_upgrade() function from frame-system.
+Removed the specific migration .anciallaries from the frame-system pallet level.
+Introducted a new module that hosts self-contained ancillary functions and logic to perform the storage migration. The current logic attempts to infer the state of the storage based on whether or not a given migration can be conducted.
* Formatting.
* + Removed specific AccountData struct. AccountData must now be provided during the runtime implementation of the trait V2ToV3.
+ Removed apply function.
+ Made the individual translation function self-sufficient.
* + Removed unused decorators.
Bastian Köcher