Feature: possibility to choose tasks scope

[anthonyraf]

I don't know if it's a good idea but sometimes I want to create tasks specifically for a unique project (inside a directory) so I propose to add a feature to set tasks scope, for example to start inside a directory you can just type pls init and all global tasks will not appear when I use pls tasks in the folder and its childs. So a settings file will be created inside the project directory.

[guedesfelipe]

It's a good idea! Feel free to open another PR with this resource...

I'm currently busy developing other stuff