(modifiers, modifier_key_support_tested,

(modifiers, modifier_key_support_tested,
modifiers_recorded): New variables.
(EMACS_LCONTROL, EMACS_RCONTROL, EMACS_LMENU,
EMACS_RMENU): New macros.
(test_modifier_support, record_keydown, record_keyup,
modifier_set, construct_modifiers): New functions.
(win32_wnd_proc): Monitor modifier keyup and keydown messages.
Map window modifiers into console modifiers to unify input.

	(x_create_frame): Use the FixedSys font as the default font.
(x_to_win32_font): For now, always use ANSI_CHARSET.