Sd-utils

made `on_register` hook for plugins optional
this is to prevent users who don't need this hook from implementing it

added `iterate_all` method for plugin manangers and `on_iterate` hook for plugins
this is for the use case where you need to iterate over all plugins without running a single on directly. An example could be a file validation system where each plugin is used to validate a different part of the file.

improved plugins and provided better documentation

First minor release of this library, now includes 2 basic features, logging and plugins.

This is the first release of this package. it only includes basic logging functionality