Fix the popup versions of qt_yn_function() to handle control
characters by using the same key press event decoding routine
and menus and extended commands. Moves 'keyValue()' to
qt_key.cpp and its declaration to qt_key.h, requring several
files to start using #include "qt_key.h".
'make depend' update to follow.
Enable existing wc_popup_dialog option. Use it in yn_function()
instead using a mystery value which apparently used to live in Qt
Settings but isn't there anymore so couldn't be turned on or off.
Also replaces conditional USE_POPUPS which isn't defined anywhere
either so presumably came from CFLAGS and only supported "yn?",
"ynq?", and "rl?" with hardcoded Qt popups rather than using
NetHackQtYnDialog.
Doing that revealed that the popup dialog for ynaq was in pretty
bad shape. It's functional but still needs a lot of work, beyond
the limited Qt/C++ capability I possess. The KeyPress issue which
accepts <shift> as input, thereby preventing <shift>+<character>
from being typed during ynaq prompting, is particularly nasty.
Append the ynaq dialog's response to the message line containing
the corresponding prompt similar to what's now done for regular
yn_function().
Add getlin() prompt+response to the message window.
I've been trying to figure out how to make ^[ be treated as ESC but
so far have failed. That key combination just acts like a dead key.
But one bit of cp_key.cpp can be implemented instead of ignored.
No change in behavior because the keyboard-state value isn't being
used anywhere.
