Change Mom to SlotMachine

rather large commit, but essentially a simple rename
Rationale in docs and blogs

lib/slot_machine/macro/get_internal_byte.rb

@@ -0,0 +1,17 @@
+module Mom
+  class GetInternalByte < Macro
+    def to_risc(compiler)
+      builder = compiler.builder(compiler.source)
+      integer_tmp = builder.allocate_int
+      builder.build do
+        object! << message[:receiver]
+        integer! << message[:arg1] #"at"
+        integer.reduce_int
+        object <= object[integer]
+        integer_tmp[Parfait::Integer.integer_index] << object
+        message[:return_value] << integer_tmp
+      end
+      return compiler
+    end
+  end
+end