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Add regression test for UPPERCASE, LOWERCASE, FENCE, WINDOW, and WRAP.

Add regression tests for UPPERCASEand LOWERCASE, including a test for bug #1576430, which is that UPPERCASE and LOWERCASE don't convert international letters.

Split the example into two programlisting tags, since the examples were independent of each other.

Fix a one-time memory leak of the names of the current read stream and the current write stream, but cleaning it up at shutdown. This memory leak would not have affected the user, but it did introduce false-positives in my memory leak tracking tools, so fixing it helps me find the real leaks.

Add regression tests for WINDOW, FENCE, and WRAP modes, including a regression test for bug #1573077.

Move the tests for WINDOWSET from window.lgo to windowset.lgo so that I could put the tests for WINDOW into window.lgo.

Add a common prefix to all files generated by CHECKSCREEN so that the show up next to each other in explorer.

Redeclare the global variable "out_of_bounds" as static, since it is not referenced outside of graphics.cpp.

Ignore the baseline test images that are used by the automated tests.

Add a simple smoke-test for drawing in 3D perspective mode. More in-depth tests will be added later for each of the drawing commands, but this is much better than nothing.

Add a helper function for running commands that move the turtle out-of-bounds. This is an easy way of testing that the current mode is "fence".