Move more version-info-related stuff to version_info.c.

Have a ws_init_version_info() routine that, given an application name
string:

	constructs the app-name-and-version-information string, and
	saves it;

	adds the initial crash information on platforms that support it,
	and saves it.

Have show_version() use the saved information and take no arguments.

Add a show_help_header() routine to print the header for --help
command-line options, given a description of the application; it prints
the application name and version information, the description, and the
"See {wireshark.org URL}" line.

Use those routines in various places, including providing the
"application name" string in pcapng SHBs.

Change-Id: I0042a8fcc91aa919ad5c381a8b8674a007ce66df
Reviewed-on: https://code.wireshark.org/review/31029
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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