FMSLogo Code

Rewrite the introduction matter, which I was told comes across as demeaning.
The new material is more honest and doesn't put undue emphasis on the archaic
distinction between "interpreted" and "compiled" languages.

Make links for POS and POSXYZ in the description of Expert mode.

Change the way the autocomplete logic is invoked from being in ON_KEY_DOWN to using acelerators, invoke this from all of windows that use a CLogoCodeCtrl, and change the shortcut from Ctrl+Enter to Ctrl+Space.

Add a rudimentary implementation of autocomplete for procedures.

Fix the comments to indicate that this file is specific to FMSLogo, not the standard Scintilla.

Remove some conditional compilation that was added to work around
a bug in GTK wxWidgets 2.8 which no longer exists in wxWidgets 3.0.

Fix a bug where printing a very long line did not end up with the commander history scrolling to the bottom.

Fix a regression that was introduced during the upgrade to wxWidgets 3.1.0 where the commaner input would retain its horizontal scroll position when its text was replaced. This was especially bad when a long line was replaced by a short one, in which case the new text might not be visible at all.

Fix a build break when compiling with WX_PURE.

Add UI automation to the editor tests to relieve some of the manual burden when running a full test pass.