E3-1144: Restore after init

See merge request e3/e3-require!140

E3-1126: Install metadata as the very last install step

See merge request e3/e3-require!137

This should take place after every single architecture has been finished. If any of them
fail, then the metadata file will _not_ be installed.

E3-1066: Refactor require.c

See merge request e3/e3-require!132

There are two changes here:
* The initHookRegistrar was being run when initially when require registers
  itself. But this is just telling it to run `fillModuleListRecord` later,
  which seems cleaner to do as a part of registering require instead of
  indirectly. Note that the debug check can never actually happen as the
  variable `requireDebug` will always be 0 at this point in time.
* The environment variables being set is slightly different, in the sense
  that if you did not `require foo` at all you did not set these environment
  variables at all. However, it seems to me to make more sense to either set
  them independent of loading a module, or perhaps not at all; either which
  way it seems odd that it depended on us loading a module.

This was a function from the original require, but it wasn't even
ever used there...

This was only used for some older location to look for libraries and other
files. We do not use that in our packaging system.

E3-1203: Fix issue where modifying certain wrapper files would cause failure

See merge request e3/e3-require!134

The issue was that `git status --porcelain` formats its output in such
a way that `make` no longer passes the variables correctly. The solution
is simply to no longer pass the `git status` data.

Note that the git status data already was not that sufficient in terms
of recognising what changes had been made, since all it provided was
information as to which files had been modified, not how they had been
modified.

E3-1215: Fix issue with multiple records that include dbCommon.dbd

See merge request e3/e3-require!133

E3-1161: Remove separate install_module target

See merge request e3/e3-require!130

This removal allows us to remove the `hdrs` target from every module; there
were only two modules that still used it, and they have both been fixed.

E3-1197: Fix possible memory issues

See merge request e3/e3-require!131

This was reported by cppcheck over require's code:
require-ess/src/runScript.c:128:12: error: Common realloc mistake: 'line_raw' nulled but not freed upon failure [memleakOnRealloc]
      if ((line_raw = realloc(line_raw, line_raw_size *= 2)) == NULL)
           ^

Unfortunately realloc can return null, in that case if we use something
like
line_raw = realloc(line_raw, size);
The memory pointed by line_raw is lost.

This was reported running cppcheck over require's code.
require-ess/src/require.c:1002:33: error: Uninitialized variable: &modulediroffs [uninitvar]
               dirname, module, &modulediroffs);
                                ^
require-ess/src/require.c:996:18: note: Assuming condition is false
      if (dirlen == 0) continue; /* ignore empty driverpath elements */
                 ^
require-ess/src/require.c:1002:33: note: Uninitialized variable: &modulediroffs
               dirname, module, &modulediroffs);
                                ^

In function ‘compareVersions’,
    inlined from ‘require_priv’ at .././src/require.c:1025:29:
.././src/require.c:640:9: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.././src/require.c:601:28: note: in definition of macro ‘debug’
  601 |   if (requireDebug) printf(__VA_ARGS__)
      |                            ^~~~~~~~~~~
.././src/require.c: In function ‘require_priv’:
.././src/require.c:640:53: note: format string is defined here
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |                                                     ^~
In function ‘compareVersions’,
    inlined from ‘require_priv’ at .././src/require.c:1025:29:
.././src/require.c:640:9: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.././src/require.c:601:28: note: in definition of macro ‘debug’
  601 |   if (requireDebug) printf(__VA_ARGS__)
      |                            ^~~~~~~~~~~
.././src/require.c: In function ‘require_priv’:
.././src/require.c:640:53: note: format string is defined here
  640 |   debug("require: compareVersions(found=%s, request=%s)\n", found, request);
      |                                                     ^~
.././src/require.c:1031:50: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
 1031 |                 printf("require: %s %s may match %s\n", module, currentFilename,
      |                                                  ^~

E3-1186: Allow tests to be run with debug architecture if specified

See merge request e3/e3-require!129