sound applet: linuxmint/Cinnamon#2170 instead of hardcoding the default theme, Gtk search pathes are used instead to use the icons in the current theme, for icons player-*
sound applet: linuxmint/Cinnamon#2170 instead of using theme defined icons, symbolics media-playback-* are used
sound applet: fixed variant number two, TextImageMenuItem had an argument too much
Merge pull request #3593 from pixunil/sound-applet-theme-issue

Fixed #2170: sound applet player status icons
Cinnamon Settings: mintdrivers link label "Device Drivers" -> "Driver Manager" (consistent with mintdriver's .desktop file)
Merge branch 'master' of github.com:linuxmint/Cinnamon
menu applet: Add open-with context menus to recent files
menu applet: recent files - don't show unusable open-with programs for non-native
files.
menu applet: fix default open-with program highlight
wip
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