This protects us from cyclic dependencies. Unfortunatelly as part of this, i had to introduce the imp Project as trait implementations since now Project is foreign
We want to move towards having each functional domain in a separate crate.
The main benefit of that for our project is that this will enforce a unidirectional dependency graph (i.e. no cycles).
Starting off with virutal_branches - a lot of the implementation is still in core (i.e. virtual.rs), that will be moved in a separate PR.
Furthermore, the virtual branches controller (as well as virtual.rs) contain functions not directly related to branches (e.g. commit reordering etc). That will be furthe separate in a crate.
- instrument snapshot creation to assure we see errors (which are ignored in code)
- move tests for public `entry` types into integration tests
- rename `OperationType` to `OperationKind` as it's more commmon in Rust
- Use `Copy` where possible
- streamline implementation: remove clones and allocations, without going zero-copy
- Prefer direct calls to traits to avoid `write!("{}")` just to invoke a trait fmt implementation
- avoid `pub` when `pub(crate)` will do
- strong type for created_at
Previously, tests were included by `app.rs` which is the entrypoint
for intgration tests, but there were also loose `.rs` files which
each count as separate test (with their own binary).
This wasn't intended and I don't know what happened there,
so now `core.rs` is the entrypoint.
