fix #2549 -- no reuse BIF names

- fixed docs to not demonstrate reuse of built-in function
  names "str" and "int", even when within a one-off script

- note: did *not* change the "str" and "int" shown in
  Howto/Starting/Part1/Learning-Typeclasses.md file,
  as those are class variables (i.e., Character.str and
  Character.int), which does not replace the BIFs of
  str() and int(). Therefore, methods inside the class
  can still use the python BIFs. While this is possibly
  confusing to new python programmers, it is also not
  within the scope of #2549.

misc edits:
- add .vscode/ to gitignore

docs/source/Howto/Starting/Part1/Python-basic-introduction.md

@@ -128,7 +128,7 @@ instead.
 Here's the stat-example again, moving the stats to variables (here we just set them, but in a real
 game they may be changed over time, or modified by circumstance):
 
-    > py str, dex, int = 13, 14, 8 ; print("STR: {}, DEX: {}, INT: {}".format(stren, dex, int))
+    > py stren, dex, intel = 13, 14, 8 ; print("STR: {}, DEX: {dex}, INT: {}".format(stren, dex, intel))
     STR: 13, DEX: 14, INT: 8
 
 The point is that even if the values of the stats change, the print() statement would not change - it just keeps
@@ -148,7 +148,7 @@ An f-string on its own is just like any other string. But let's redo the example
 We could just insert that `a` variable directly into the f-string using `{a}`. Fewer parentheses to
 remember and arguable easier to read as well.
 
-    > py str, dex, int = 13, 14, 8 ; print(f"STR: {str}, DEX: {dex}, INT: {int}")
+    > py stren, dex, intel = 13, 14, 8 ; print(f"STR: {stren}, DEX: {dex}, INT: {intel}")
     STR: 13, DEX: 14, INT: 8
 
 We will be exploring more complex string concepts when we get to creating Commands and need to