Add typegen_detect_type for detecting types useful during
client/server/proxy code generation.

widl: Use type_get_type to determine the types of types during C client, server and proxy code generation.

Use type_get_type and friends instead.

gdi32/tests: Don't test the height that is 1.75 times the original font height. This is unscaled in winnt yet doubled in win9x.

We can't assume that wctomb(Unicode default char) is identical to the Ansi
default char.