[FR] Plugins for Pyttman

[dotchetter]

Please share your idea!
Pyttman should offer a Plugin API.
The Plugin API would allow developers of applications to both create custom
plugins, and to use existing ones by installing them using git or pip.

The Plugins would simply be configured in the settings file, such as:

PLUGINS = [
    SomePlugn(**config),
]

The Plugins should have a way to interact with the lifecycle of the app in different ways, such as before app starts, before intent responds, and corresponding after- hooks.