fix: resolve issues with reading and writing ARC4 types

Reading and writing dynamic ARC4 types in an array
Modifying ARC4 tuple items (#152)
Require ARC4 struct initialisation to have unaliased values to maintain reference semantics

examples/arc-28/out/EventEmitter.approval.mir

@@ -67,9 +67,9 @@ emit_swapped_block@0:
     frame_dig -1                                   //                                                           load b#0 from parameters                             (𝕡) a#0,b#0 | b#0                                                                                            Swapped(b, a)                                                                    arc-28/contract.py:12
     frame_dig -2                                   //                                                           load a#0 from parameters                             (𝕡) a#0,b#0 | b#0,a#0                                                                                        Swapped(b, a)                                                                    arc-28/contract.py:12
     concat                                         //                                                                                                                (𝕡) a#0,b#0 | {concat}                                                                                       Swapped(b, a)                                                                    arc-28/contract.py:12
-    //                                             virtual: store encoded_tuple_buffer%0#2 to l-stack (no copy) (𝕡) a#0,b#0 | encoded_tuple_buffer%0#2                                                                                          Swapped(b, a)                     arc-28/contract.py:12
-    method "Swapped(uint64,uint64)"                //                                                                                                                (𝕡) a#0,b#0 | encoded_tuple_buffer%0#2,method<"Swapped(uint64,uint64)">                                      arc4.emit(Swapped(b, a))                                                         arc-28/contract.py:12
-    swap                                           //                                                           load encoded_tuple_buffer%0#2 from l-stack (no copy) (𝕡) a#0,b#0 | method<"Swapped(uint64,uint64)">,encoded_tuple_buffer%0#2                                      arc4.emit(Swapped(b, a))                                                         arc-28/contract.py:12
+    //                                             virtual: store encoded_tuple_buffer%2#0 to l-stack (no copy) (𝕡) a#0,b#0 | encoded_tuple_buffer%2#0                                                                                          Swapped(b, a)                     arc-28/contract.py:12
+    method "Swapped(uint64,uint64)"                //                                                                                                                (𝕡) a#0,b#0 | encoded_tuple_buffer%2#0,method<"Swapped(uint64,uint64)">                                      arc4.emit(Swapped(b, a))                                                         arc-28/contract.py:12
+    swap                                           //                                                           load encoded_tuple_buffer%2#0 from l-stack (no copy) (𝕡) a#0,b#0 | method<"Swapped(uint64,uint64)">,encoded_tuple_buffer%2#0                                      arc4.emit(Swapped(b, a))                                                         arc-28/contract.py:12
     concat                                         //                                                                                                                (𝕡) a#0,b#0 | {concat}                                                                                       arc4.emit(Swapped(b, a))                                                         arc-28/contract.py:12
     //                                             virtual: store tmp%0#0 to l-stack (no copy)                  (𝕡) a#0,b#0 | tmp%0#0                                                                                                           arc4.emit(Swapped(b, a))          arc-28/contract.py:12
     dup                                            //                                                           load tmp%0#0 from l-stack (copy)                     (𝕡) a#0,b#0 | tmp%0#0,tmp%0#0                                                                                arc4.emit(Swapped(b, a))                                                         arc-28/contract.py:12