Bundle dotfiles into sets

[Timoses]

One might not want to have all git repo dotfiles synchronized on a machine. At the same time picking out single dotfiles to be synchronized by hand might be tedious if the user only wants to synchronize dotfiles for a specific program (which may be more than one file).

Sets could be used to bundle dotfiles together and allowing the user to for example do

dotfim set add/sync <setName>

[Timoses]

This approach tries to offer the same feature that can be implemented with #3 profiles!

The term 'Profile' appears more fitting and offers more flexibility.

Therefore, closing this issue.