fix let* format, new on stack guessing case, type failure, handle casts

[water111]

Fixes #1821 by adding a special case for new method calls where the argument with type symbol is actually an address to uninitialized structure on the stack.

Fixes #1849 (or at least the cause of the issue Vaser gave in chat, and one random one I found in debug-sphere)

Fixes #1853

Fixes #1857 by moving the cast into the cond if the body is a single form and the destination type is a bitfield/enum which is likely to work well. Seems to work on the examples we could find in jak 1 and jak 2.

Also fixes an issue with casts on the result of handle->process (a common place to use casts)

the output of process->handle is a plain process. Most of the time, you end up casting this to a more specific. If you add a cast on every use of the variable, the decompiler will decide to change the type of that variable to the more specific type, and this breaks the handle cast.

so previously it was impossible to get code like

    (let* ((s2-0 (the-as swingpole (handle->process (-> self control hack))))
           (gp-0 (-> s2-0 dir))
           )

But now it will work