shell32/tests: Test ShellExecute()'s URL handling.

[Francois Gouget]

Also tweak the class creation functions and add create_test_class() so
one can create a class without associating it with an extension.

Signed-off-by: Francois Gouget <fgouget at free.fr>
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Sent as an attachment in the hope to evade my ISP's spam detection 
filter :-(

 dlls/shell32/tests/shlexec.c | 200 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 162 insertions(+), 38 deletions(-)
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