spice-protocol comes with 2 headers to handle structure packing,
but controller_prot.h and foreign_menu_prot were both using their
own preprocessor definitions to handle packing. It's better to have
structure packing macros centralized since how it's done varies
between compilers, so it may need to change over time.
We are making all text send over the controller socket utf-8, rather then
having somethings as 8 bit (hostname) and others unicode16.
Adjust the CONTROLLER_MENU_*_DELIMITER defines for this.
