Rename Block to RubyBlock at Ruby level

The parser presents the whole call that defines the block as a block. And so does the Ruby layer, as we don't want to do processing in ast.
Just making it clearer, also Vool:: block will have to be renamed

test/ruby/test_ruby_block_statement.rb

@@ -0,0 +1,56 @@
+require_relative "helper"
+
+module Ruby
+  class TestBlockStatement < MiniTest::Test
+    include RubyTests
+
+    def setup()
+      input = "plus_one{|arg1| arg1 + 1 } "
+      @lst = compile( input )
+    end
+    def test_block
+      assert_equal RubyBlockStatement , @lst.class
+    end
+    def test_send
+      assert_equal SendStatement , @lst.send.class
+    end
+    def test_method_name
+      assert_equal :plus_one , @lst.send.name
+    end
+    def test_block_args
+      assert_equal [:arg1] , @lst.args
+    end
+    def test_block_body
+      assert_equal SendStatement , @lst.body.class
+      assert_equal 1 , @lst.body.arguments.length
+    end
+  end
+  class TestBlockStatementVool < MiniTest::Test
+    include RubyTests
+
+    def setup()
+      input = "plus_one{|arg1| arg1 + 1 } "
+      @lst = compile( input ).to_vool
+    end
+    def test_block
+      assert_equal Vool::Statements , @lst.class
+    end
+    def test_first
+      assert_equal Vool::LocalAssignment , @lst.first.class
+      assert @lst.first.name.to_s.start_with?("implicit_block_")
+      assert_equal Vool::BlockStatement , @lst.first.value.class
+    end
+    def test_last_send
+      assert_equal 2 , @lst.length
+      assert_equal Vool::SendStatement , @lst.last.class
+      assert_equal :plus_one , @lst.last.name
+    end
+    def test_send_block_arg
+      assert_equal 1 , @lst.last.arguments.length
+      assert @lst.last.arguments.first.name.to_s.start_with?("implicit_block_")
+    end
+    def test_block_args
+      assert_equal [:arg1] , @lst.first.value.args
+    end
+  end
+end