Dhii/callback-abstract

# Dhii - Callback Aware Traits

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Traits for objects that are aware of callback functions.

## Traits
- [`ArgsAwareTrait`][ArgsAwareTrait] - Functionality for awareness of an argument list.
- [`CallbackAwareTrait`][CallbackAwareTrait] - Functionality for awareness of a callback.
- [`InvokeCallableCapableTrait`][InvokeCallableCapableTrait] - Allows structured invocation of any callable.
- [`InvokeCallbackCapableTrait`][InvokeCallbackCapableTrait] - Allows structured invocation of an assigned callback.

[Dhii]: https://github.com/Dhii/dhii

[ArgsAwareTrait]:                           src/ArgsAwareTrait.php
[CallbackAwareTrait]:                       src/CallbackAwareTrait.php
[InvokeCallableCapableTrait]:               src/InvokeCallableCapableTrait.php
[InvokeCallbackCapableTrait]:               src/InvokeCallbackCapableTrait.php