remove duplicate action code for instance, image and cloud view

current implementation has a lot of duplicate code in order to handle actions on the same deltacloud instances and images in the different views.

The cloud view uses:

CVInstanceElement and CVImageElement

The image view uses:

DeltaCloudImage

The instance view uses:

DeltaCloudInstance

The current code does not use adapters and therefore duplicated action-, providers etc. to handle these different object types. The result is that changes (a lot of the current issues) get tedious.

The solution is pretty simple:
Use the DeltaCloudInstance and DeltaCloudImage everywhere, wire UI by using adapters.