huge cleanup and conversion of most string handling (especially paths) to unicode

please note: format strings must be %hs for char* arguments and %ls for
wchar_t*

This was SVN commit r7161.

source/test_setup.cpp

@@ -58,7 +58,7 @@ class LeakReporter : public CxxTest::GlobalFixture
 static LeakReporter leakReporter;
 
 // Definition of function from lib/self_test.h
-bool ts_str_contains(const std::string& str1, const std::string& str2)
+bool ts_str_contains(const std::wstring& str1, const std::wstring& str2)
 {
 	return str1.find(str2) != str1.npos;
 }