Brief summary of issue / Description of requested feature:

Provide command line interface for installing, searching, and updating mudlet packages from an online package repository.
Something like this has been started by @keneanung at https://github.com/keneanung/MudletPackageManager which I believe we can use for a base

Steps to reproduce the issue / Reasons for adding feature:

1. Right now long and complex one line install commands or pre-downloaded packages must be used. Mudlet should be able to use apt/yum like interface

Error output / Expected result of feature

mpkg install MudletUI should install the MudletUI pkg from the default pkg repository
mpkg upgrade MudletUI should make sure you have the latest version, and if not update it
etc

Extra information, such as Mudlet version, operating system and ideas for how to solve / implement:

Goal for 5.0, will also require the pkg server repository be done (see #3069)