Implement deeper Git integration

[dhruvkb]

Description

Integrating with Git provides us a some additional information.

• status of the files (as in unchanged, modified, renamed, untracked etc.)
• files and folders that are ignored by Git

Based on this data, we can augment our calculations of importance and also implement colors based on Git status, instead of just applying color based on specs.

We currently already have limited Git integration set up to find and use .pls.yml file from the repository root, we need to expand on that.