Introduce singleton types

Just for future, as this gives us a way to know immediately in the type, which represent normal, and which singleton classes
Also instantiate singleton class lazily (with singleton type)
This makes the type of class single, ie unique, immediately when it is used, ie methods or variables defined.
Fixes a design mistake, where all singletonn classes shared the same type, and thus unique methods per class were impossible
(Also some misc in commit)

test/risc/interpreter/calling/test_minus.rb

@@ -38,7 +38,7 @@ module Risc
       ret = main_ticks(49)
       assert_equal FunctionReturn ,  ret.class
       assert_equal :r3 ,  ret.register.symbol
-      assert_equal 38236 ,  @interpreter.get_register(ret.register)
+      assert_equal 36540 ,  @interpreter.get_register(ret.register)
     end
   end
 end

test/risc/test_collector.rb

@@ -38,7 +38,7 @@ module Risc
     end
 
     def len
-      1479
+      1426
     end
 
     def test_collect_all_types
@@ -70,7 +70,7 @@ module Risc
     end
 
     def len
-      2959
+      2906
     end
   end
 end

test/risc/test_interpreter.rb

@@ -54,7 +54,7 @@ module Risc
     end
     def test_pc
       @interpreter.tick
-      assert_equal t = 37800 , @interpreter.pc
+      assert_equal t = 36104 , @interpreter.pc
       @interpreter.tick
       assert_equal t + 4 , @interpreter.pc
     end

test/risc/test_linker.rb

@@ -24,7 +24,7 @@ module Risc
       assert_equal 0 ,  Position.get(@linker.cpu_init).at
     end
     def test_cpu_at
-      assert_equal "0x941c" ,  Position.get(@linker.cpu_init.first).to_s
+      assert_equal "0x8d7c" ,  Position.get(@linker.cpu_init.first).to_s
     end
     def test_cpu_label
       assert_equal Position ,  Position.get(@linker.cpu_init.first).class