Refactor changed CIM plugin behaviour

[JSCU-CNI]

The following change in #27 modified the behaviour of DataRegion.get_value:

7398596#diff-e5afd30094460643d9391ddeccd8dd021e5dde2df200d43b8bd080ea477f0fbfR411-R418

-        else:
-            ValueError("Unknown value type")
+
+        raise ValueError("Unknown value type")

It turns out often occurring integer types such as CIM_TYPES.UINT16 are not extracted. This proably failed silently before but now breaks the dissect.target cim.consumerbindings plugin.