- Extract AbstractJavaContextTypeCore
- Add addCompatibleContextType() into IJavaContext
- Move AbstractVariableResolver, FieldResolver, LocalVarResolver, NameResolver, VarResolver to jdt.core.manipulation

Change-Id: Ie762477ed3f665ec0b0e2e28dfba6ce83177afb1
Signed-off-by: Sheng Chen <sheche@microsoft.com>