FMSLogo Code

Remove the "wxWidgets" suffix from the version in the About Box. This is not unnecessary since the wxWidgets version is the only version (that is, it's implied by the version number of 7.0)

Remove the now-unused translations for LOCALIZED_ERROR_HHCTRLATOMNOTFOUND.

Remove the build-time dependency on HTML Help Workshop and instead use wxWidgets API to access the help. This became possible after the Borland OWL version was removed and the screensaver was ported to wxWidgets.

This was done to make FMSLogo easier to build.

Add a missing #include when compiling without precompiled headers

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).