New module: X.A.Profiles

[mislavzanic]

Description

This PR adds a new module used for grouping workspaces, thus expanding upon the "workspace per action" philosophy.
Features of Profiles:

• filtering workspaces per Profile (both when navigating through workspaces and on a bar)
• adding keybindings per Profile
• adding workspaces from other Profiles to the current one
• a history hook that remembers workspaces per Profile

Checklist

• [x] I've read CONTRIBUTING.md

• [x] I've considered how to best test these changes (property, unit, manually, ...) and concluded: tested it by using it extensively for a year on my personal and work laptops

• [x] I updated the CHANGES.md file

[geekosaur]

Thanks!