Locked / Readonly state of Items is tracked in views instead of Items

[gkronber]

Views for items may be locked or set to readonly to prevent changes e.g. while an algorithm is running.

HL allows multiple active views for the same item. This can lead to inconsistent lock states for views.

For instance for the GA - TSP sample:

1. Select BestKnownQuality parameter
2. Start the algorithm --> the view for the parameter is locked
3. Open another view for the BestKnownQuality parameter by double-clicking the ViewHost icon
4. The value is locked in the new view (when the algorithm is still running)
5. When the algorithm stops the view for BestKnownQuality is unlocked.
6. However, the second view is still locked (expected: all views should be unlocked when the item is unlocked)