FMSLogo Code

Explicitly refresh the screen after creating the window.
This is needed on GNU/Linux (GTK) to show the turtle in its initial position.

Fix a recent regression in GetScreenWindow where it returned the HWND of the main window, not the screen.
This probably caused many problems, but the one I noticed is that the turtle didn't move until the window was resized.
The fix was implemented by rewriting GetScreenWindow and GetMainWindow in terms of their "Wx" counterparts, which makes the implementation clearer.

Disable anti-aliasing when drawing lines on GTK/Linux.
Although anti-aliasing makes pictures look nicer, it interferes with basic FMSLogo functionality like FILL and BITMAPTURTLE and PENERASE. The problem is that the anti-aliasing leaves a outline around the line that was drawn which those procedures don't expect.

Fix a bug that prevented FMSLogo from shutting down on GNU/Linux when the commander was undocked.

Partially implement PLAYWAVE on GNU/Linux.
This enables sound effects in Asteriod Miner.

Fix a problem that prevented "make test" from running on GNU/Linux
The name of Logolib was made lower-case.

Cleanup: Remove wxpurestubs.cpp
The GNU/Linux wxWidgets has come far enough that it is no longer needed.

Cleanup: remove dib.cpp and dib.h. These were no longer used.

Move the timer functions out of mmwind.cpp and into timer.cpp and integrate it into the WX_PURE build.
This was done enable SETTIMER and CLEARTIMER on GNU/Linux, a requirement for playing asteriod miner.
It's also cleaner to keep the timer-related functions separate from the multi-media functions.

Port SETTIMER and CLEARTIMER to wxWidgets
This was done to make those procedures functional on GNU/Linux, a necessity for running asteroid miner.