[system settings] Add potability to uninstall multiple apps from Storage page.

[Szymon Waliczek]

Version: Ubuntu 14.10 r17

Reproduce:
- open settings app
- scroll down and click on "About this phone"
- click on "Storage"

Result:
User is presented with storage usage chart and list of installed apps on device.

Expectation:
Would be nice to have an option to selection multiple apps and be able to uninstall them in just one click.
I was playing with the phone and installed bunch of unwanted apps and then when it comes to cleaning it takes me ages to uninstall all those apps as you have to go to home App scope find an app press and hold (loading lime is very long...) then click Uninstall and then Confirm... after all this is done the whole Apps scope need to reload and you have to do all over again.

[Sebastien Bacher (seb128)]

Thanks, that's a feature not included in the current design
https://wiki.ubuntu.com/AboutThisDevice#phone-storage

Adding ubuntu-ux to the bug report, that would need to be specified

[Côme Chilliet (come-5)]

Also, for application which are already uninstalled, a long clic should allow to delete their data as well. (at the very least is should open the file manager on the concerned folder so that we can delete it ourselves)