Add a hint to skip notifications grouping
Plasma currently groups notifications that have the same notification title or if they are on a "blacklist" (like media player apps that popup a notification for each song change), but sometimes the grouping needs to be skipped. This is for example when user removes two widgets from his desktop and the "Undo" notification appears, these cannot be grouped. This is currently handled rather by a hack in the notifications server, so introducing this new flag should allow for a clean and proper solution. REVIEW: 126459 CCBUG: 356653
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