rename register to risc

seems to fit the layer much better as we really have a very reduced
instruction set

lib/risc/instructions/byte_to_reg.rb

@@ -0,0 +1,20 @@
+module Risc
+
+  # ByteToReg moves a single byte into a register from memory.
+
+  # indexes are 1 based (as for slots) , which means we sacrifice a byte of every word
+  #        for our sanity
+
+  class ByteToReg < Getter
+
+  end
+
+  # Produce a ByteToReg instruction.
+  # from and to are translated (from symbol to register if neccessary)
+  # but index is left as is.
+  def self.byte_to_reg( source , array , index , to)
+     array = resolve_to_register( array)
+     to = resolve_to_register( to)
+     ByteToReg.new( source , array , index , to)
+  end
+end