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Change dir.h to direct.h so that unix.cpp compiles with both the Borland and Microsoft compilers.

Remove the dependency on OWL.

Refactor memory_count from main.cpp to mem.cpp, since it was never referenced in main.cpp.

Refactor so that wrksp.cpp has no direct dependency on OWL.

Fix a bug where m_StreamIsBinary was not properly initialized.

Update expected results to match some recent changes to the tests.

Refactor the main code to make more of it buildable by the Microsoft SDK compiler.

* Created screenwindow.cpp, which abstracts the windowing framework from the language engine.
* Renamed ibmturt.h to ibmterm.h to match the name of the .cpp file.
* Refactored g_OpenFiles in files.cpp so that it kept track of if the FILE* was opened for binary, rather than using an unportable check.
* Split Borland OWL parts out of mainwind.cpp and into mainframe.cpp.

Add the behavior when READCHAR is reading from a binary file.

Improve READCHARTEST.SMOKETEST so that it tests calling READCHAR on a file that has been opened for text reading and one that has been opened for binary reading.

Add a regression test that you can open and open file, provided that the subsequent filename has a different case than the original.