Add fullcolor icons

These icons are used in the main menu and on the status icons. Previously part of the Adwaita icon theme.

Main menu:

• places/start-here: Main menu
• categories/applications-other: Applications, Applications > Other
• categories/applications-accessories: Applications > Utility
• apps/preferences-desktop-accessibility: Applications > Universal Access
• categories/applications-development: Applications > Development
• categories/applications-science: Applications > Education
• categories/applications-games: Applications > Games
• categories/applications-graphics: Applications > Graphics
• categories/applications-internet: Applications > Internet, Applications > Web Applications
• categories/applications-multimedia: Applications > Multimedia
• categories/applications-office: Applications > Office
• categories/applications-engineering: Applications > Science (MR: !56 (merged))
• categories/applications-system: Applications > System
• categories/preferences-desktop: Applications > System > Preferences
• categories/preferences-system: Applications > System > Administration
• actions/document-open-recent: Places > Recent Documents
• actions/edit-clear-all: Places > Recent Documents > Clear Recent Documents...
• apps/system-users: User > Switch User
• actions/system-log-out: User > Log Out
• actions/system-lock-screen: User > Lock Screen
• actions/view-refresh: User > Restart
• actions/system-shutdown: User > Power Off

Weather status icon (returned by gweather_info_get_icon_name()):

• status/weather-clear
• status/weather-clear-night
• status/weather-few-clouds
• status/weather-few-clouds-night
• status/weather-fog
• status/weather-overcast
• status/weather-showers
• status/weather-snow
• status/weather-storm

Battery status icon (returned by gf_upower_device_gen_get_icon_name (self->device)):

• devices/battery
• status/battery-caution
• status/battery-caution-charging
• status/battery-empty
• status/battery-full
• status/battery-full-charged
• status/battery-full-charging
• status/battery-good
• status/battery-good-charging
• status/battery-low
• status/battery-low-charging
• status/battery-missing

Volume status icon:

• devices/audio-input-microphone
• devices/audio-speakers
• status/audio-volume-muted
• status/audio-volume-low
• status/audio-volume-medium
• status/audio-volume-high
• status/microphone-sensitivity-muted
• status/microphone-sensitivity-low
• status/microphone-sensitivity-medium
• status/microphone-sensitivity-high

Bluetooth status icon:

• status/bluetooth-active
• status/bluetooth-disabled

Notifications status icon:

• actions/mail-message-new

Depends on: gnome-panel!67

Closes: #86