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Fix a build break in the screensaver caused by recent changes in netwind.cpp.

Extend test coverage to include WINDOWSET for hiding/showing.
Extend test coverage to include WINDOWSET based on button text (not supported)
Also extract some procedures to wrap the DLLCALL, mostly to make the code more readable.

Stop calling CMainFrame::PostCheckQueueMessage from netwind.cpp
I added this as part of a larger change that stopped passing an HWND around in netwind.cpp. This broke the build for the screensaver because CMainFrame doesn't exist in the screensaver.

I have reverted back to using the win32 ::PostMessage on the main frame's HWND.

Small changes
- Add a bad input test for [] (NULL in C)
- Remove a redundant call to FindWindow

Extend the proof-of-concept HTTP server to support executing turtle commands on a POST.

Refactoring: Extract UIAUTOMATION.MOVEWINDOW
This was done to remove code duplication within the tests and to make the calling code more readable.

Document how UIAUTOMATION.POSTEVENT works.
Also update UIAUTOMATION.POSTKEYTOWINDOW to prove that :event can be a list.

UIAUTOMATION.POSTEVENT is going to be used by the MESSAGEBOX tests to get the position of a modal dialog box.

Remove unneeded parens in final example of IFELSE

Remove the "See Also" REPCOUNT in the documentation for REPEAT.
There was already a link to REPCOUNT in the description, so the See Also was redundant.

Minor improvements to SETFLOODCOLOR:
1) Add a second example that sets a color vector by variables (someone asked how to do this on a forum).
2) Change the first example to use a color name, since the second example uses a color vector.