add appstream support and redesign ui

data/applications/pamac-manager.desktop

data/applications/pamac-updater.desktop

po/pamac.pot

po/pot_head

resources/choose_ignorepkgs_dialog.ui

resources/choose_provider_dialog.ui

resources/history_dialog.ui

resources/manager_window.ui

resources/package-generic.png

resources/pamac.manager.gresource.xml

resources/preferences_dialog.ui

resources/progress_box.ui

resources/progress_dialog.ui

resources/transaction_sum_dialog.ui

src/Makefile

src/manager.vala

src/manager_window.vala

src/package.vala

src/preferences_dialog.vala

src/system_daemon.vala