This combines a massive code re-folding with functionlity expansion
that allows us to track multiple verbs per handler or per application.
Also fixes a few issues and removes a function that made no sense.
An extra argument to g_win32_registry_key_get_value_w() and
g_win32_registry_key_get_value() indicates that RegLoadMUIStringW()
should be used instead of RegQueryValueExW(). It only works on
strings, and automatically resolves resource strings (the ones
that start with "@").
The extra argument is needed to find resource DLLs that are only
specified by their relative name.
