Get lights and rooms by their name

[thibauult]

This PR mainly allows to find lights and rooms by their name. A pretty big refactoring was necessary in order to ease the implementation of this feature.

We introduced a "Home Context" that is load at command bootstrap. This context contains all the resources that are necessary to display the information to the user:

• bridge_home
• rooms
• devices
• lights
• grouped lights

We hope that this refactoring will ease future developments.