Split wxPersistenceManager-related tests and actually build them

It seems better to organize the tests in different files and just
provide a common fixture-like class to reuse functionality.

Also use this as an opportunity to rewrite the tests to use Catch
directly instead of using CppUnit-compatible macros.

Finally, actually build these tests as part of the test suite.

tests/test_vc7_test_gui.vcproj

@@ -355,6 +355,9 @@
 			<File
 				RelativePath=".\config\config.cpp">
 			</File>
+			<File
+				RelativePath=".\persistence\dataview.cpp">
+			</File>
 			<File
 				RelativePath=".\controls\dataviewctrltest.cpp">
 			</File>
@@ -559,6 +562,9 @@
 			<File
 				RelativePath=".\controls\textentrytest.cpp">
 			</File>
+			<File
+				RelativePath=".\persistence\tlw.cpp">
+			</File>
 			<File
 				RelativePath=".\controls\togglebuttontest.cpp">
 			</File>