[Console] document new 2.4 features

[xabbuh]

See the article New in Symfony 2.4: Console improvements for more details about these features:

• the Compact Layout Table Helper (added the compact layout information #3025)
• shortcut methods to detect the verbosity level (Documents Output::*Verbose methods #3048)
• setting the terminal dimensions
• register commands in the service container ([WCM]Register Commands in the Service Container #3031)

[wouterj]

seems like 2 issues aren't documented yet, @fabpot ?

[wouterj]

ping @lyrixx, as you contributed both features :)

[lyrixx]

Does we really should document all methods ? IMHO, this is useless.

[wouterj]

it would be very usefull to update the verbosity section with methods about checking the verbosity. Terminal demensions, not sure...

[lyrixx]

Can we close this one ?