FMSLogo Code

Fix a build break when compiling with wxWidgets prior to 3.0.2.
The break was introduced in the fix for bug #473, which added
references to wxWidgets key codes that are new in 3.1.0.

Fix bug #473; which is a regression in KEYBOARDVALUE from the OWL version where a handful of characters on a US keyboard (;/`[]\=) has inconsistent with MSWLogo.

The root cause is that I tried to write some platform-independent handlers that would return the correct values using only wxWidget API. Having looked into this in more detail, I don't think this is possible, as I would at least need some platform-specific logic to determine the keyboard layout. I have therefore decided that, if platform-specific logic is required, the Windows version might as well use the raw platform codes from the event, which should exactly match the codes used by OWL. I have retained the platform-independent logic for non-Windows platforms.

Document the keycode for "Alt" which could not be captured with OWL, but is captured in wxWidgets.

Replace constants from winuser.h for virtual key codes with codes that are local to FMSLogo so that KEYBOARDON can work on non-Windows platforms. This also adds some virtual key codes for media keyboards.

Fix an incorrectly documented key code.

More clearly document that KEYBOARDON with one input is for capturing text and KEYBOARDON with two inputs is for capturing keystrokes. Include documentation of the numeric representation of the keystrokes.

Fix some false-positives failures about library routines not being document that were introduced when the Logolib files were lower-cased to make them work properly on GNU/Linux.

Fix a problem with the way the updated icon was exported in the previous revision. Apparently Windows cannot process icons with embedded PNGs (at least Windows XP cannot).

Update the icon to the latest version provided by Jan Grabe.

This includes separate layers for the light green triangle and the polygon decorations on the turtle's shell, and the turtle's shell. It also includes a white background for the text to make it more prominent.

Fix a typo in a comment