Final API clean up for v2.0

[dotMorten]

Perform API review and do a final clean up prior to releasing 2.0.

Common:

• [x] NotificationCode and NotificationType: Only types not prefixed ZW
• [x] ZWNotification.GroupIdx: Idx should be Index
• [x] ZWNotification.ValueID: Should be ValueId (lower-case 'd')
• [x] ZWValueID: Should be ZWValueId (lower-case 'd')
• [x] ZWManager.GetSUCNodeId: SUC should be Suc
• [x] ZWManager.OnNotification: Poor event name -> NotificationReceived
• [x] ManagedNotificationsHandler: Fix naming NotificationReceivedEventHandler - add sender as first argument.. Wrap ZWNotification in NotificationReceivedEventArgs type.

.NET:

• [x] ZWValueID: IDisposable only implemented in .NET

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.NET API

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UWP API