v0.11.0

Focussing on bug fixes, modernisation and performance improvements.
The memory footprint has been reduced substantially

Major changes since v0.10

* Modernising the code base and infrastructure:
  * Begin adopting C++20
  * Use the `ruff` linter / formatter 
  * Use CPM and simplify CMake.
* Fixing problems with diffusion
  * Update units and scaling
  * Correct solver matrix coefficients
* :warning: Modcc used to mis-compile `-K^n` into `(-K)^n` due to a parser error 
* Allow probing of point mechanism state variables by tag.

Breaking changes

* Stricter checks on network construction / simulation parameters.
  * connections will now throw errors when given negative / zero delays
  * simulation will throw when given a network with minimum delay less than the
    timestep
* Discretisation now is a property of the `cable_cell` object, no longer the
  `decor`

New tutorials and documentation

* Plasticity tutorial
* Add connectivity tutorial
  
Internal changes

* Auto-generate type stubs
* Remove clock for std::chrono
* added E_R to lif cell model
* Performance
  * Fix embarrassingly quadratic bug in fvm-layout
  * Faster sort spikes
  * Faster event dispatch
* Memory footprint
  * Create less intermediate data from events
  * Elide GPU allocations for unused arrays (`Xd`, `Xi`, ...)
* Clean-up catalogue extension.
* Refactor discretization

v0.10.0

Major Changes since v0.9.0

* Automatic network generation from high-level specifications.
* Units at the user interface including scaling and conversion.
* Morphologies are loaded through a unified interface; which produces a bundle of morphology, metadata, and segment tree.

Internal Updates

* Documentation overhaul
* Python bindings offer type stubs; giving auto-completion and inline documentation in some editors/IDEs.
* Performance improvements
  - Label resolution uses hashes instead of strings, saving memory, network traffic, and time.
  - Spike delivery is up to 30% faster leading to 10% end-to-end improvements in some cases (e.g. `example/brunel`) 
  - Load balancing is faster and doesn't rely on MPI, leading to shorter setup times for large networks.
* Fixes
  - Better support for source builds on MacOS (aarch64)
  - `modcc` no longer allows internal variables (`v`, `celsius`, ...) as `ASSIGNED`
  - Better support for raw (C++) mechanisms
* MC cells renamed cable cells.

Breaking changes

* Return values of all morphology loaders have changed.
* Raw (segment tree) loaders removed.
* Support for Python 3.8 removed.
* C++: Removed `simulation::inject_events`, use a generator instead. 
  
New Contributors

* @ErbB4 made their first contribution in https://github.com/arbor-sim/arbor/pull/2271

Full Changelog: https://github.com/arbor-sim/arbor/compare/v0.9.0...v0.10.0