feat: Desugaring of polymorphic method calls

Methods calls which must make use of the virtual table are now
desugared. For example a method call within a method such as `foo(1, 2)`
will now be desugared into `__vtable_{FB_NAME}#(THIS^.__vtable^).foo^(THIS^, 1, 2)`.
Similarly, a variable like `refInstance: POINTER TO FbA` making a method call
such as `refInstance^.foo(1, 2)` will be lowered into some similar form, except
not making use of THIS, rather of the operator name (excluding the method name), i.e.
`__vtable_FbA#(refInstance^.__vtable^).foo(refInstance^, 1, 2)`.

Author: volsa

.vscode/launch.json

@@ -4,29 +4,31 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
-    {
-        "type": "codelldb",
-        "request": "launch",
-        "name": "Debug codelldb standard_lib",
-        "cargo": {
+        {
+            "type": "codelldb",
+            "request": "launch",
+            "name": "Debug codelldb standard_lib",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=plc",
+                    "--package=plc_driver"
+                ],
+                "filter": {
+                    "name": "plc",
+                    "kind": "bin"
+                }
+            },
+            "program": "target/debug/plc",
             "args": [
-                "build",
-                "--bin=plc",
-                "--package=plc_driver"
+                "libs/stdlib/iec61131-st/*.st"
             ],
-            "filter": {
-                "name": "plc",
-                "kind": "bin"
-            }
-        },
-        "program": "target/debug/plc",
-        "args": ["libs/stdlib/iec61131-st/*.st"],
-        "cwd": "${workspaceFolder}",
-        "env": {
-            "RUST_LOG": "rusty"
+            "cwd": "${workspaceFolder}",
+            "env": {
+                "RUST_LOG": "rusty"
+            },
+            "terminal": "integrated"
         },
-        "terminal": "integrated"
-    },
         {
             "type": "codelldb",
             "request": "launch",
@@ -43,7 +45,11 @@
                 }
             },
             "program": "target/debug/plc",
-            "args": ["target/demo.st", "-g", "-c"],
+            "args": [
+                "target/demo.st",
+                "-g",
+                "-c"
+            ],
             "cwd": "${workspaceFolder}",
             "env": {
                 "RUST_LOG": "rusty"
@@ -58,14 +64,15 @@
                 "args": [
                     "build",
                     "--bin=plc",
-                    "--package=plc_driver"
+                    "--package=plc_driver",
                 ],
                 "filter": {
                     "name": "plc",
                     "kind": "bin"
                 }
             },
             "args": [
+                "-j=1",
                 "target/demo.st",
                 "tests/lit/util/printf.pli"
             ],
@@ -107,7 +114,6 @@
             "cwd": "${workspaceFolder}",
             "program": "target/demo",
             "terminal": "integrated"
-
         }
     ]
-}
+}