Dhii/invoker-interface

# Dhii - Invoker - Interface

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## Details
Interfaces for command invocation.

### Interfaces
- [`CommandInvokerInterface`] - Something that can invoke a text command.
- [`CommandInvokerAwareInterface`] - Something that is aware of a command invoker.
- [`CommandAwareInterface`] - Something that is aware of a text command.
- [`ArgsAwareInterface`] - Something that is aware of invocation arguments.
- [`CommandInvokerExceptionInterface`] - An exception that relates to a command invoker.
- [`InvocationFailureExceptionInterface`] - An exception that signals a failed invocation.


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

[`CommandInvokerInterface`]:                                    src/CommandInvokerInterface.php
[`CommandInvokerAwareInterface`]:                               src/CommandInvokerAwareInterface.php
[`CommandAwareInterface`]:                                      src/CommandAwareInterface.php
[`ArgsAwareInterface`]:                                         src/ArgsAwareInterface.php
[`CommandInvokerExceptionInterface`]:                           src/CommandInvokerExceptionInterface.php
[`InvocationFailureExceptionInterface`]:                        src/InvocationFailureExceptionInterface.php