Don't display the cursor on the graphical screen while doing a quiet
boot.  When doing a quiet boot we will probably show the graphical
screen for a fair bit of time; as a result, we really don't want a
completely bogus cursor blob on the bottom of the screen.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add a MENU RESOLUTION command to make it possible to set a nonstandard
resolution.  If the nonstandard resolution is unavailable, we revert
to the text mode screen.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add (disabled) debugging hooks to the menu system.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Automatically reformat com32/menu/menu.h using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Change MENU SAVE to be a cascading default that can be reverted with
MENU NOSAVE.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Implement MENU SAVE, which allows the menu system to retain the
previous selection from one boot to another.  In the process, fix the
syslinux_setadv() function.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add a new "UI" directive to specify a user interface module, instead
of abusing the DEFAULT directive.  This allows the DEFAULT directive
to be used for setting the default, even when the menu system is
enabled.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Avoid leaving obvious password turds in memory.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Break off execute() into its own source file, with the intent of being
able to re-use it for a CLI module.