replace any Elements#getAllMembers calls

Move MethodRetrievalProcessor#allEnclosingElementsIncludeSuper to Executables#getAllEnclosingExecutableElements and replace any Elements#getAllMembers calls with it (to create a fixed order of property mappings).

@gunnarmorling: I'm pretty sure the commit could use some code-formatting... :wink: 


Right, that stupid code template in eclipse... need to change that one again.

Thanks for the merge!