Inspiaaa/UnityHFSM

In a time of ever-increasing RAM prices, you’ll be delighted to hear that we’ve **fixed a critical memory leak** in the new Animator Graph visualisation feature. Additionally, we've resolved a synchronisation issue that could trigger internal consistency errors in the Unity Editor. Special thanks to @sandsalamand for the contribution.

Version 2.1 of UnityHFSM adds exciting new features, while once again improving performance. With the new `ParallelStates` class, you can effortlessly run multiple sub-states / state machines in parallel. At the same time, the new `StateChanged` event and the `rememberLastState` feature make (hierarchical) state machines more powerful and flexible to your use cases than ever before. If you're working with complex, large state machines, these are up to 15% faster now thanks to general optimisations. Bugs have been fixed, naming improved, and new documentation has been written. For more information on the latest changes, please see the [changelog](https://github.com/Inspiaaa/UnityHFSM/blob/master/Changelog.md).

This release fixes the sample code which did not compile after the recent 2.0.0 release. It also reintroduces the `timer` field in the `CoState` class which was lost in the previous release. If you are migrating from a pre-2.0 version, please see the [changelog](https://github.com/Inspiaaa/UnityHFSM/blob/master/Changelog.md), as the 2.0 release includes compatibility-breaking changes.

Version 2.0.0 comes with exciting new features such as **ghost states**, **transition callbacks** and **exit transitions**. Exit transitions finally provide an easy and powerful way to define the exit conditions for nested state machines, essentially levelling up the mechanics behind **hierarchical state machines**. At the same time, **debugging** complex hierarchical state machines has never been easier thanks to the new `GetActiveHierarchyPath()` method. In addition, the latest release comes with **many improvements** to existing features, such as the support for coroutines, the `canExit` mechanics, and the `HybridStateMachine` class, while also fixing numerous bugs related to delayed transitions. Thanks to refactorings, the internal code is easier to read and maintain. Please see the [changelog](https://github.com/Inspiaaa/UnityHFSM/blob/master/Changelog.md) when migrating to the latest version, as it includes compatibility-breaking changes.

Version 1.9.0 of UnityHFSM introduces the **action system** which allows you to define custom events (like `OnLogic`) that can call functions in the active states. This release also adds "**two way transitions**" which can greatly reduce the amount of boilerplate code required in many cases. Furthermore **performance** has been increased when using value types as the state names (e.g. `State<int>`). 👍 Read more: [Changelog](https://github.com/Inspiaaa/UnityHFSM/blob/master/Changelog.md)

Version 1.8 of UnityHFSM adds support for generics. Now the datatype of state identifiers / names and the type of event names can be easily changed. Thanks to the new "shortcut methods", state machines can be written with less boilerplate than ever and certain cases, such as empty states, can be optimised automatically for you. 👍 1.8 also adds support for installation via Unity's package manager UPM. Read more: [Changelog](https://github.com/Inspiaaa/UnityHFSM/blob/master/Changelog.md)

:sparkles: 1.7.2 let's you activate triggers that can propagate down the hierarchy to the active sub-states. :+1:

✨ Version 1.7 introduces Trigger Transitions which let you effortlessly leverage the efficiency of event-based transitions, in combination with the full power of the existing high-level transition types. 👍 The error messages have been greatly improved in 1.7.1, so that they are concise and helpful.