stand/lua: Consistently organize modules

We follow pretty closely the following structure of a module:

1. Copyright notice
2. Module requires
3. Module local declarations
4. Module local definition

stand/lua: Consistently organize modules

We follow pretty closely the following structure of a module:

1. Copyright notice
2. Module requires
3. Module local declarations
4. Module local definitions
5. Module exports
6. return

Re-organize the one-offs (config/drawer) and denote the start of module
exports with a comment.

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stand/lua: Add copyright notice in places

I've made some not-insignificant changes to config, menu, and password bits
of our lua scripts. Add a copyright notice to them to reflect.

stand/lua: Re-order locals after copyright notice; require comes first

stand/lua: Clear the screen before prompting for passwords

In the worst case scenario, we have no passwords to prompt for and we end up
just clearing the screen twice before we draw the menu or proc

stand/lua: Clear the screen before prompting for passwords

In the worst case scenario, we have no passwords to prompt for and we end up
just clearing the screen twice before we draw the menu or proceed with boot.

In the best case scenario, we don't try drawing password prompts amidst a
bunch of kernel/module loading.

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stand/lua: Debugging string snuck in...

stand/lua: Style pass

These are the style points that I'd like to try and maintain in our lua
scripts:
- Parentheses around conditionals
- Trailing semicolons, except on block terminators
- s:method

stand/lua: Style pass

These are the style points that I'd like to try and maintain in our lua
scripts:
- Parentheses around conditionals
- Trailing semicolons, except on block terminators
- s:method(...) instead of string.method(s, ...) where applicable

There's likely more, but that'll get hammered out as we continue.

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stand/lua: Check for nil (GELI prompt)

stand/lua: Add optional GELI passphrase prompt

Prompt for GELI passphrase when geom_eli_passphrase_prompt has been set to
"YES" in loader.conf(5).

This entailed breaking out the password prompt int

stand/lua: Add optional GELI passphrase prompt

Prompt for GELI passphrase when geom_eli_passphrase_prompt has been set to
"YES" in loader.conf(5).

This entailed breaking out the password prompt into its own function that
can be reused between the password compare bits and this prompt that simply
takes the entered password and passes it along in the environment as
kern.geom.eli.passphrase.

I've also added a TODO to re-evaluate later if we want the "password
masking" -- it is currently not functional, so one still can't observe the
length of the password typed at the prompt.

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

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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