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: 


Let's better use `{@code true}`. There is some advantage to this syntax, I've forgotten though which one it is :) I'll change it.