FMSLogo Code

Fix a build break on GNU/Linux when precompiled headers aren't used.

Fix a misspelling of "independent" in a comment

Restore some broken logic in label() for drawing directly to the screen DC.
This logic is compiled out of the final code; it exists to highlight why the current logic is not like it was in MSWLogo.

Add a regression test for when LABEL is given a word with line breaks.
MSWLogo ignored the line breaks, but after porting LABEL from win32 to wxWidgets, they are now honored.

Cleanup: Replace LogFontToWxFont with wxFont(LOGFONT).
wxWidgets has a constructor which does the same thing, so there's no need to duplicate its internal logic within FMSLogo.

Fix an unintentional change in behavior of LABLESIZE after porting it from win32 to wxWidgets.
wxDC->GetTextExtent(String) returns a bounding box that is larger than what ::GetTextExtentPoint returns.
This was found by the regression tests in label.lgo.

Fix a build break when compiling without precompiled headers

Enable setting the font face with SETLABELFONT on GNU/Linux.

Replace <section> with <variablelist> for the description of each menu item in the Workspace Editor.
Each <section> is rendered as a separate page, which is too much space for a one sentence description for something like Edit - Undo. This puts all items in the same menu on the same page.
This also removes some noise from the table of contents.

Add a screenshot of the workspace editor to the "Editor" section.