stand/lua: Correct usage and acceptance of BACKSPACE/DELETE keys

stand/lua: Remove sneaky kernel assignment

stand/lua: Create/use some MENU_ constants where applicable

stand/lua: Set ACPI's default the proper way (setACPI)

stand/lua: Remove a magic number/string (not a trivial literal)

We'll arbitrarily use KEYSTR_ for string representations of non-trivial
characters.

stand/lua: Consistently use semicolons for line endings

stand/lua: Set reasonable ACPI default based on presence

Set it based on hint.acpi.0.rsdp. Initially, hint.acpi.0.disabled will be
respected. "Using System Defaults" will override whether it's expli

stand/lua: Set reasonable ACPI default based on presence

Set it based on hint.acpi.0.rsdp. Initially, hint.acpi.0.disabled will be
respected. "Using System Defaults" will override whether it's explicitly
disabled by hint and re-load it based on whether it's present on the system.

Unlike the 4th version, this is not restricted to x86. I have no strong
reasoning for this, so this is definitely open to change.

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stand/lua: Reduce magic numbers

Enter/backspace values are hardcoded in both the menu and password scripts.
Separate these out to core for reuse between the two.

Add the lua scripts from the lua-bootloader SoC

These are the .lua files from from Pedro Souza's 2014 Summer of Code
project. Rui Paulo, Pedro Arthur and Wojciech A. Koszek also
contributed.

Obtain

Add the lua scripts from the lua-bootloader SoC

These are the .lua files from from Pedro Souza's 2014 Summer of Code
project. Rui Paulo, Pedro Arthur and Wojciech A. Koszek also
contributed.

Obtained from: https://wiki.freebsd.org/SummerOfCode2014/LuaLoader
Sponsored by: Google Summer of Code

Improve the SoC lua menu code to bring it in line with forth
menu functionality

Submitted by: Zakary Nafziger
Sponsored by: FreeBSD Foundation

Use loader.setenv and loader.unsetenv instead of loader.perform

Convert from include("/boot/foo.lua") to foo = require("foo");
to bring in line with latest lua module conventions.

Enforce a uniform style for the new .lua files:
o hard tab indenation for 8 spaces
o don't have if foo then bar; else bas; end on one line

MFC After: 1 month
Relnotes: yes
Differential Review: https://reviews.freebsd.org/D14295

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