FMSLogo Code

Fix Bug #598; QUEUE and DEQUEUE now behave correctly when the queue name is shadowed by one of their own local variables.
The fix is to rewrite these procedures as macros that get evaluated in the caller's context.
For performance, when the queue name doesn't clash with a local variable, the previous implementation is run.

Update the tests so that a full test pass can run on GNU/Linux.
In some cases, this meant finding ways to make tests run differently on Windows or GNU/Linux.
In most cases, this meant not running tests whose execution depends on Windows,
such as any test that uses UIAUTOMATIONLIB, which uses DLLCALL for win32 API.

Refactoring: Replace CURRENTWORKINGDIRECTORY with GETCURRENTDIRECTORY in dllcall.
This removes duplicated code.

Adjust some of the assert statements that I had added to the inline functions.
The getstr* functions now call is_word() which works for all string types.
Confusingly, is_string() is a special case of is_word().

Also treepair__tree is not always called on a tree.
This may be a bug, which I'll look into later.
For now, it's more important for fmslogo to run with asserts than to have this assert.

Fix a typo in a comment

Comment out the "assert(is_tree(tree))" that I recently added to settreepair__tree(tree, treepair).
There are code paths, notably in treeify_line, which invoke untreeify on nodes that aren't trees.
That could be a bug, but having the assert is counter-productive as it currently fires on nearly any procedure call.
If the untreeify logic can be rewritten to only be invoked on trees, then I will re-enable the assert.

Add comments to explain the purpose and function of the two different stacks used by the evaluator.

Fix an inaccurate claim in a comment.
MSWLogo did not sort the output of FILES and DIRECTORIES.
That was a fix made in FMSLogo 6.33.0.

Rewrite directory_helper in terms wxWidgets instead of in terms of WIN32 API.
This makes FILES and DIRECTORIES work on GNU/Linux.

Replace "TRUE" with "true" because ther literal is used as a bool, not a BOOLEAN.