loader/4th: Move from hint.acpi.0.rsdp to acpi.rsdp

Use acpi.rsdp to test for ACPI. 4th wasn't updated with the old compat
was dropped a while ago.

MFC After: 1 week
Sponsored by: Netflix

Remove $FreeBSD$: one-line forth tag

Remove /^\\[\s*]*\$FreeBSD\$.*$\n/

loader: do not output empty menu title

As we output spaces around the menu title, we should also check,
if the title is actually empty string.

PR: 255299
Submitted by: Jose Luis Duran
Reported by:

loader: do not output empty menu title

As we output spaces around the menu title, we should also check,
if the title is actually empty string.

PR: 255299
Submitted by: Jose Luis Duran
Reported by: Jose Luis Duran
MFC after: 1 week

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loader: insert spaces around menu title

Small visual nit, make menu title more clean

MFC after: 3 days

loader: implement framebuffer console

Draw console on efi.
Add vbe framebuffer for BIOS loader (vbe off, vbe on, vbe list,
vbe set xxx).
autoload font (/boot/fonts) based on resolution and font size

loader: implement framebuffer console

Draw console on efi.
Add vbe framebuffer for BIOS loader (vbe off, vbe on, vbe list,
vbe set xxx).
autoload font (/boot/fonts) based on resolution and font size.
Add command loadfont (set font by file) and
variable screen.font (set font by size). Pass loaded font to kernel.

Export variables:
screen.height
screen.width
screen.depth

Add gfx primitives to draw the screen and put png image on the screen.
Rework menu draw to iterate list of consoles to enamble device specific
output.

Probably something else I forgot...

Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D27420

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Merge ^/head r352587 through r352763.

loader_4th: menu items need to reset color attribute, not switch to white

Forth menu kernel and BE entries, instead of resetting the color attribute,
are switching to white color.

Merge ^/head r325663 through r325841.

Move sys/boot to stand. Fix all references to new location

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