move all position setting into position

Position and subclasses handle the logic, external to
the classes, so it can be swapped out later
(at runtime positions can’t change)

Guardfile

@@ -12,6 +12,9 @@ guard :minitest do   # with Minitest::Unit
   # if any file XX in any directory in the /lib changes, run a test_XX in the
   # shadow directory in the /test
   watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}test_#{m[2]}.rb" }
+  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}test_#{m[2]}1.rb" }
+  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}test_#{m[2]}2.rb" }
+  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/#{m[1]}test_#{m[2]}3.rb" }
 
   #Arm instructions
   watch(%r{^lib/arm/instructions/(.+)_instruction.rb}) { |m| "test/arm/test_#{m[1]}.rb" }