Replace some chr calls with chr_utf_8

Author: m-ender

alice.rb

@@ -68,11 +68,11 @@ def run
                 iterator = @state.get_iterator
                 case iterator
                 when Integer
-                    iterator.times { @state.mode.process cell.chr }
+                    iterator.times { @state.mode.process cell.chr_utf_8 }
                 when String
                     iterator.each_char do |c|
                         @state.push c
-                        @state.mode.process cell.chr
+                        @state.mode.process cell.chr_utf_8
                     end
                 end
             end

mode.rb

@@ -940,10 +940,10 @@ def process cmd
                 end
             end
         when :join_tape
-            push @state.tape.keys.sort.map{|i| @state.tape[i]}.select{|v| is_char?(v)}.map(&:chr).join
+            push @state.tape.keys.sort.map{|i| @state.tape[i]}.select{|v| is_char?(v)}.map(&:chr_utf_8).join
 
         when :leave_string_mode
-            push @state.current_string.select{|c| is_char? c }.map(&:chr).join
+            push @state.current_string.select{|c| is_char? c }.map(&:chr_utf_8).join
         when :escape
             old_ip = @state.ip
             old_dir = @state.dir