Write out type format strings for string types.

Write out type format strings for arrays, except for the missing
generic functionality of conformance and variance descriptors.

Simplify handling of types in write_typeformatstring_type by only
writing non-pointer types out when ptr_level is 0. Add stubs for
functions that will write out the type format string for strings and
arrays.

Since a var_t can now be passed in, rename to
write_typeformatstring_var. Simplifies the code.

Renamed to write_procformatstring_var now since we can pass a var_t in
again. This results in simpler code.

Uwe Bonnes).

Move the firing of control events from internal helper functions to
MSI_ProcessMessage so that custom actions can all cause control events
to be fired.
Added the firing of progress events.

library crash.

Added casts for size_t values.

- 32/64: number of symbols is now correct
- 64: the 64 bit extra fields are now initialized with some non null
  yet sensible value

frame context.

In SymInitialize, now trying to check if the hProcess is a real live
target or not. If we think it is, try to grasp ELF information from
it.

- better coding for SYMBOL_INFO filling
- some fixes on some fields (parameters)
- now using the max size for symbol info

- Change menu item search algorithm to recurse into a submenu first.
- Fallback to a found submenu if nothing else was found.

Since setting the Progress attribute is done quite frequently, don't
flood the user with messages about it being unimplemented.