Working change list searching

Tested that search query text is correctly processed and a database query can be formed
CardsFragment: Loader accepts database query (where and bindargs) directly
Cleanup variables

Note: Only tested SearchKeyword ('subject'). This needs better error checking on
 improperly formed searchkeywords (such as not providing a param).
The query change listener should be removed and the query should be
 non-dynamic, due to how the query text is processed.

Change-Id: I4a69847d278e09b407dc1547b44e7304f90d814e