[patch] Use hash for optional args with long argument list in Ruby bindings

Hi kou,

I suggested a patch like this a while back, but you wanted to make it a new
api and to check the hash options. So that's what is different in this one.

Although I didn't modify Hash for checking like the example from ActiveSupport
that you showed. It didn't seem right to modify a standard class from the SVN
bindings.

Here's hoping this is more like what you had in mind.

--
Joe
[[[
Use a hash to simulate named arguments instead of a long list of optional
arguments.
* subversion/bindings/swig/ruby/test/test_wc.rb
  (SvnWcTest#test_update_editor_options): New test
* subversion/bindings/swig/ruby/svn/wc.rb
  (Svn::Client::Context#update_editor2,Svn::Client::Context#switch_editor2):
   Use a hash of optional arguments instead of a very long argument list.
  (Svn::Client::Context#validate_options): New method to ensure hash arguments
   are understood.
]]]

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