Windows: build with UNICODE, get rid of all TCHAR/TEXT(), use explicit

xxA() interfaces and wchar_t in some places. Add a static cleanup retry
method to TempFile, called after clearing the MimeHandler cache (killing
the subprocesses which might hold an open file).

src/testmains/trrclutil.cpp

@@ -0,0 +1,51 @@
+
+#include "rclutil.h"
+
+
+void path_to_thumb(const string& _input)
+{
+    string input(_input);
+    // Make absolute path if needed
+    if (input[0] != '/') {
+        input = path_absolute(input);
+    }
+
+    input = string("file://") + path_canon(input);
+
+    string path;
+    //path = url_encode(input, 7);
+    thumbPathForUrl(input, 7, path);
+    cout << path << endl;
+}
+
+const char *thisprog;
+
+int main(int argc, const char **argv)
+{
+    thisprog = *argv++;
+    argc--;
+
+    string s;
+    vector<string>::const_iterator it;
+
+#if 0
+    if (argc > 1) {
+        cerr <<  "Usage: thumbpath <filepath>" << endl;
+        exit(1);
+    }
+    string input;
+    if (argc == 1) {
+        input = *argv++;
+        if (input.empty())  {
+            cerr << "Usage: thumbpath <filepath>" << endl;
+            exit(1);
+        }
+        path_to_thumb(input);
+    } else {
+        while (getline(cin, input)) {
+            path_to_thumb(input);
+        }
+    }
+    exit(0);
+#endif
+}