Add version information and CLI option to print it

This may optionally include metadata (such as the short hash of
the commit being built) by defining VERSION_META with the relevant
data at build time.

The initial release was tagged as 1.0. Per semantic versioning, the
addition of the -v flag is technically a breaking change, so
update to 2.0.0.

jbfinspect.c

@@ -2,7 +2,11 @@
 Parsing code for Jasc Browser Files generated by Paint Shop Pro et al.
 Format is documented below, and again in the binary.
 The author disclaims all copyright on this code.
+*/
+
+#define VERSION_STRING "2.0.0"
 
+/*
 JBF format description:
 Integers are little endian except where specified
 Where fixed length C-strings are specified, beyond first NUL is garbage
@@ -544,30 +548,34 @@ const char* type_lookup(uint32_t code) {
 }
 
 void usage(char* self, bool h) {
-	    printf("Usage: %s [-orqDh] [-d path] pspbrwse.jbf\n",self);
+	    printf("Usage: %s [-orqDhv] [-d path] pspbrwse.jbf\n",self);
 	if(h) puts("List or extract the contents of Jasc thumbnail caches.\n\n"
 	           "   -d   Extract thumbnails to given directory.\n"
 	           "   -o   Highlight orphaned files. With -d, only extract these.\n"
 	           "   -r   When extracting files, recreate path found in jbf under pwd or directory given by -d.\n"
 	           "        Useful for batch processing with e.g. find.\n"
 	           "   -q   Don't list contents.\n"
 	           "   -D   Print format documentation.\n"
-	           "   -h   Show this help.\n");
+	           "   -h   Show this help.\n"
+	           "   -v   Show version information.\n");
 	exit(0);
 }
 
 int main(int argc, char* argv[]) {
 	int opt;
 	char* outdir = NULL;
 	bool orphaned_check = false, recreate = false, quiet = false;
-	while((opt = getopt(argc,argv,"roqd:hD")) != -1)
+	while((opt = getopt(argc,argv,"roqd:hDv")) != -1)
 		switch(opt) {
 			case 'o': orphaned_check = true; break;
 			case 'r': recreate = true; break;
 			case 'd': outdir = optarg; break;
 			case 'q': quiet = true; break;
 			case 'D': puts(doc); return 0;
 			case 'h': usage(argv[0],1);
+			case 'v':
+				puts("version " VERSION_STRING VERSION_META);
+				exit(0);
 			default : usage(argv[0],0);
 		}
 	if(argc - optind != 1)