Create SteamSpeak cli.

[dalexhd]

🚀 Feature

The feature consists in adding a SteamSpeak installation CLI.

Have you read the Contributing Guidelines on issues?

Yes.

Motivation

This will allow users SteamSpeak updating and installing process much friendly.

Pitch

Everyone likes easy things. Installing SteamSepak is easy, since you only need to clone the repository. But updating may be a bit more complex.
The basic idea is to add a version migration system. This means that if you're going to update from 1.1 to 1.4, 1.2 & 1.3 & 1.4 migration files are going to be executed. This also applies to downgrades.