FMSLogo Code

Fix problems that prevented Logolib routines from being callable on platforms
with a case-sensitive file system (Mac, GNU/Linux). I chose to normalize as
lower-case for compatibility with UCBLogo.

Fix the #include to include only the definition of wxString,
which is the only type that the macros reference.

Add comments to silent_load()

Remove references to the GiveFocusToEditbox global variable.

Once upon a time, this was used to give focus to the commander's edit box after the "Edall" button was pressed. This was a vestige from MSWLogo, which was compiled using Borland OWL and was unable to redirect keystrokes from the Edall button to the commander input after the Edall button had focus. In the current wxWidgets implementation, this isn't needed and its existence made the code unnecessarily more difficult to understand.

Replace win32 calls for opening the file picker with wxWidgets API calls. This became required after the previous revision, where I replaced the FILEFILTER localized strings with ones that only worked in wxWidgets.

Rework the file load/save dialog boxes to use pure wxWidgets code,
instead of win32 functions. This makes it possible to load files
on other platforms, such as GNU/Linux (a precondition for running
the tests).

Implement feature #59; use a new icon that doesn't look like a mismash of red, white, and black. The icon was provided by Jan Grabe. I converted it to a Gimp image so that it could be converted to XPM and would be easier to make modifications to later.

Fix the expected output of infinity to match the output of gcc, instead of Borland's compiler. Now that the Borland OWL version of FMSLogo has been removed from the source tree, there's no reason these tests should fail when run from the only FMSLogo version that remains.

Use the same icon for the screensaver as in the main FMSLogo environment. Previously the screensaver used the same icon as the Borland version of FMSLogo and the wxWidgets version used its own icon to account for the way wxWidgets works. Since the Borland version no longer exists and the screen saver uses wxWidgets, it doesn't make sense to maintain two icon files.

Fix bug #471; the uninstaller now removes the preferences that are stored in the registry.