Fix `date --date` dependent test

This test depends on a nonportable option for date(1). I am not sure
that there is a good portable way to do this, so I just directly
included the seconds since epoch that it would have computed. We're
testing scdoc, not testing the local system's date command.

Fix timezone-dependent tests

These tests fail depending on timezone and current time if the date
differs from the UTC date. This was remedied by using `date -u`, which
is POSIX.

Expand preamble written to man page output

Replace str_t with struct str

Update version to 1.10.0

Add contrib/_incr_version

tables: add expand options

fix bug preventing indented literal blocks

This commit fixes a bug in parsing indented literal blocks. For example:

test(8)

	```
	This is a block
	```

Prior to this commit, this would fail, but with an unexpected error
message: "Error at 4:3: Cannot deindent in literal block". The
indentation was being parsed at every character, so the parser saw the
`T`, then parsed indentation again. The indentation was 0 (since there
were no tab characters between the `T` and the `h`), but the block
started with an indentation level of 1. 0 < 1, so this would be
considered a dedent, which is not allowed.

This commit introduces a new local variable, `check_indent`, which
controls whether the parser tries to parse indentation or not; now
indentation is only parsed when the last character was a newline. From
my testing this seems to fix the issue - indented literal blocks are now
allowed.

remove unnecessary `closed` variable in parse_list

This local variable was initialized to `false` and never set to true
anywhere in the function.

Update version to 1.9.6

Fix regression with manual name check

Update version to 1.9.5

enforce 1-step indentation

Allow multi-step indentation in literal blocks, and allow multi-step
dedents.

Revert "fix enforcement of 1-step indentation"

This reverts commit 8c537aa2956a55fe341e1d48110ae6985ada7e5f.

fix enforcement of 1-step indentation

disallow invalid name characters

This commit makes using invalid characters in the name a fatal error.
Before this patch, "foo | bar(1)" would parse as "foobar(1)". Now it is
a fatal error and parsing stops.

Add .build.yml

use TZ=UTC in test case

Update version to 1.9.4

Fix SOURCE_DATE_EPOCH test w/busybox date