Remove $FreeBSD$: one-line sh pattern

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

Restore and document -ps / -nps option.

Sponsored by: Klara, Inc.
Reviewed by: pauamma_gundo.com, pstef, kevans
Differential Revision: https://reviews.freebsd.org/D40788

indent(1): rename -nsac/-sac ("space after cast") to -ncs/-cs

Also update tests and the manpage.

GNU indent had the option earlier as -cs, let's not diverge unnecessarily.

indent(1): don't format function declarations as variables

indent(1): restore working -pcs

My previous indent(1) commit accidentally broke the -pcs option (which adds
space between function name and opening parenthesis in function calls) by
copying all but one of a few conditions in an if clause. Reinstate the
condition.

Add a regression test to lower the chances of breaking it again.

Correct a comment with description of what the option does.

indent(1): identifiers inside parentheses are not declarations

Also make lparen position calculation consider tab stops.

This improves function pointer typedef formatting.

indent(1): Support binary integer literals.
This was done by Romain Tartière for PR123553. I initially thought that it would break code like this:
#define b00101010 -1
if (0 b00101010)
...

by joining 0 and b00101010 together. However, the real problem with that patch was that once it saw a 0, it assumed that the number was base 2, 8 or 16, ignoring base 10 floating point numbers. I fixed that.

I didn't copy the diagnostic part of the original patch as it seems out of scope of implementing binary integer literals formatting.

PR: 123553
Submitted by: romain (original version)
Approved by: pfg (mentor)

Integrate indent tests added in r313544 into ATF/Kyua and the FreeBSD
test suite

This change does the following:

- Introduces symmetry in the test inputs/outputs by adding the exit
code to the files. This simplified the test driver notably by
requiring less filename/test name manipulation.
- Adds a test driver for the testcases added in r313544, patterned
after bin/sh/tests/functional_test.sh . The driver calls indent as
noted in r313544, with an exception: The $FreeBSD$ RCS keyword's
expansion is reindented with indent, which means that the output
differs from the expected output. Thus, all lines with $FreeBSD$
in them are deleted on the fly, both in the input file and the
output file.

The test inputs/outputs are copied to the kyua sandbox before the
test is run as the pathing in some of the files relies on pathing
normalized to the current directory (copying the files is the
easiest way to resolve the issue).

Approved by: pstef (maintainer)
Reviewed by: pstef
X-MFC with: r313544
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D9682