[Ironruby-core] Code Review: MoreSites4

[Tomas Matousek]

  tfpt review "/shelveset:MoreSites4;REDMOND\tomat"

DLR change:
  Inherits SiteLocalStorage<T> from SiteLocalStorage class and enables any subclass of SiteLocalStorage to be created as a storage for data in a rule.

Ruby:
  Implements multiple SiteLocalStorage subclasses for the most frequent site storage types: CallSiteStorage, BinaryOpStorage, UnaryOpStorage, ConversionStorage.
  Implements ConvertToHashAction, fixes implementation of ConvertToSAction.
  Conversion actions now use RubyContext not RubyScope. This simplifies their calls from libraries yet causes a minor incompatibility with MRI: if a parameter-less method that works with a local scope, such as "private", is aliased and given the name of a conversion method ("to_s", e.g.) and a conversion of an object with such aliased method is attempted, the scope-manipulating method fails to update the scope properly. This is not a real world scenario so it should be fine to ignore it. The fix would require to define 2 instances of each protocol conversion action - one HasScope flag and the other without it.

  Removes more static sites.

Tomas
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