Bug fixes and new "Update World"

Replaced "Upgradeable packages" module with "emerge -uDpv world": "Upgradeable packages" tab is replaced with "Update World". Adapted gui to that.
Added button "Add all" in Emerge queue" tab.
Added flags, size and category in emerge pretend listView.
Guitoo does not start with checking "Update World". User can refresh by hand.
Added emerge "Status" with icon in "emerge queue" showing user when package has been emerged to world.
Added colored text for more clearer feedback.
Disabled "emerge" buttons when emerge process is running.