Add field/method skipping helper functions to DexFile

Specifically added SkipStaticFields, SkipInstanceFields,
SkipAllFields, SkipStaticMethods, and SkipVirtualMethods.

Also applied the helpers to the code base.

Test: test-art-host
Change-Id: Idda77f9a6e2564c2e588d2bbe11cc320063fdb32
18 files changed