Switch icon theme to Fluent icons

resources/icons/ui/checkmark.png

resources/icons/ui/checkmark.svg

resources/icons/ui/checkmark@2x.png

resources/icons/ui/clock.png

resources/icons/ui/clock.svg

resources/icons/ui/clock@2x.png

resources/icons/ui/cloud-storage-uploading-option.png

resources/icons/ui/cloud-storage-uploading-option@2x.png

resources/icons/ui/cursor.png

resources/icons/ui/cursor@2x.png

resources/icons/ui/dismiss.svg

resources/icons/ui/do-not-disturb-rounded-sign.png

resources/icons/ui/do-not-disturb-rounded-sign@2x.png

resources/icons/ui/double-checkmark.svg

resources/icons/ui/double-tick-indicator.png

resources/icons/ui/double-tick-indicator@2x.png

resources/icons/ui/download.svg

resources/icons/ui/edit.png

resources/icons/ui/edit.svg

resources/icons/ui/edit@2x.png