Show new/updated packages feature

[falkobuttler]

It would be nice if Alcatraz could show all updated and newly added packages with a filter.
When I open it up I basically have to scroll through the whole list trying to find new (and potentially interesting) packages.

There is also no indicator which plugins have updated or have updates available.

[supermarin]

@falkobuttler will consider it as a part of the new UI

[supermarin]

cc/ @kattrali @jurre

[TofPlay]

@falkobuttler +1

[hyouuu]

It'd be super useful if it can show when a package is last updated - for example I wouldn't want a package updated 3 years ago...