Jigsaw

Fix python version checking resulting in a deprecation warning in python 3.10+

* Added support for Python 2

* Added quickload method to make initial loading of plugins take one line of code instead of three

* Added support for loading plugins from multiple paths

* Added reload_manifest method to reload a specific manifest
* Added reload_all_manifests method to reload all manifests and load any new manifests

* Added the unload_plugin method to the PluginLoader class to unload a specific plugin