[FEAT] Implemented 'if' support

[BUG] Variables inside blocks couldn't shadow those outside
[FEAT] Decompiler shows address of each opcode

test.vb

@@ -14,6 +14,11 @@ var peiv as array of 2 triangle
 const perico as number = 4-peiv[1].a.x * peiv[0].c.y[2]
 
 function tarari(a as number, b as number) as number
-    var x as number
+    var local1 as number
+    if local1 > 0 then
+        var local1 as number = 1
+    else
+        var local3 as number = 2
+    end
 end