Refactor wacs--get-config

Avoid unnecessary lookups
Add 1win winconf
Switch to using C-z prefix map
Update README to reflect new keybindings
Add wacs-comint
Switch to using put and get instead of big alists
Remove duplicates in wacspace configurations
Refactor project steps
Add :before-switch configuration option
Update README to mention :before-switch
Change :before-switch to :after-switch
Add defwacsaliases macro
Version bump: 0.4
Make all configurations inherit from :default
Tiny docstring change
Get rid of eshell require