Extract MarkupTemplate into it's own file.

lib/xrb/template.rb

@@ -130,35 +130,4 @@ def compile!
 			assembler.code
 		end
 	end
-
-	class MarkupTemplate < Template
-		class Assembler < Template::Assembler
-			# Output a string interpolation.
-			def expression(code)
-				@code << "#{OUT}<<(#{code});"
-			end
-
-			# Output raw text to the template.
-			def text(text)
-				text = text.gsub("'", "\\\\'")
-				@code << "#{OUT}.raw('#{text}');"
-			end
-		end
-
-		def to_string(scope = Object.new, output = nil)
-			super.output
-		end
-
-		protected
-
-		# We need an assembler which builds specific `Markup.append` sequences.
-		def make_assembler
-			Assembler.new
-		end
-
-		# The output of the markup template is encoded markup (e.g. with entities, tags, etc).
-		def output_buffer
-			Builder.new(encoding: code.encoding)
-		end
-	end
 end