* Add transactional storage functionality to OverlayChanges
A collection already has a natural None state. No need to
wrap it with an option.
* Add storage transactions runtime interface
* Add frame support for transactions
* Fix committed typo
* Rename 'changes' variable to 'overlay'
* Fix renaming change
* Fixed strange line break
* Rename clear to clear_where
* Add comment regarding delete value on mutation
* Add comment which changes are covered by a transaction
* Do force the arg to with_transaction return a Result
* Use rust doc comments on every documentable place
* Fix wording of insert_diry doc
* Improve doc on start_transaction
* Rename value to overlayed in close_transaction
* Inline negation
* Improve wording of close_transaction comments
* Get rid of an expect by using get_or_insert_with
* Remove trailing whitespace
* Rename should to expected in tests
* Rolling back a transaction must mark the overlay as dirty
* Protect client initiated storage tx from being droped by runtime
* Review nits
* Return Err when entering or exiting runtime fails
* Documentation fixup
* Remove close type
* Move enter/exit runtime to excute_aux in the state-machine
* Rename Discard -> Rollback
* Move child changeset creation to constructor
* Move child spawning into the closure
* Apply suggestions from code review
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
* Fixup for code suggestion
* Unify re-exports
* Rename overlay_changes to mod.rs and move into subdir
* Change proof wording
* Adapt a new test from master to storage-tx
* Suggestions from the latest round of review
* Fix warning message
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Alexander Theißen