Improved ModuleManager API
Improved ModuleManager API

Implemented load_all() method, fixed some bugs, and added distinct
exception class.

hermes-jr/npui,hermes-jr/npui,annndrey/npui-unik,annndrey/npui-unik,unikmhz/npui,nikitos/npui,unikmhz/npui,annndrey/npui-unik,unikmhz/npui,hermes-jr/npui,unikmhz/npui,nikitos/npui,annndrey/npui-unik,nikitos/npui,nikitos/npui,hermes-jr/npui