Add bluetooth support

[ulises-jeremias]

The main idea is to add support for bluetooth handling in existing dotfiles.

It would be convenient to complete the following items to have a complete support of this feature:

• [x] Define a polybar module (See how it could be customizable using xrdb parameters)
• [x] Show how this module can be overloaded by defining new ones or just changing parameters
• [x] Add a flag in the main install script to choose whether to install bluetooth support (e.g. --bluetooth).
• [x] Add the neccesary dependencies to util_pkgs in the main install script to choose to use xfce4 variants for bluetooth management (e.g. blueman will be automatically added to xfce4-settings).
• [x] Include pulse audio integration for bluetooth service (pulseaudio-module-bluetooth) in util_pkgs.

PLEASE, READ THE CONTRIBUTING GUIDE BEFORE STARTING CODING.

[ulises-jeremias]

@FGasquez maybe you are interested to create advances on this issue!