Support new/optional display file: text/menu/fileinfo.*

If this menu file exists, it'll be used to display file information (e.g.
when using 'E'xtended info or 'D'ownload commands) instead of the Fi* text.dat
strings.

Allowing more customization options for file information displays.

src/sbbs3/file.cpp

@@ -34,6 +34,7 @@ void sbbs_t::showfileinfo(file_t* f, bool show_extdesc)
 
 	current_file = f;
 	getfilepath(&cfg, f, path);
+	if(!menu("fileinfo", P_NOCRLF | P_NOERROR)) {
 		bprintf(P_TRUNCATE, text[FiLib], getusrlib(f->dir), cfg.lib[cfg.dir[f->dir]->lib]->lname);
 		bprintf(P_TRUNCATE, text[FiDir], getusrdir(f->dir), cfg.dir[f->dir]->lname);
 		bprintf(P_TRUNCATE, text[FiFilename],f->name);
@@ -96,6 +97,7 @@ void sbbs_t::showfileinfo(file_t* f, bool show_extdesc)
 		if(timetodl > 0)
 			bprintf(text[FiTransferTime],sectostr(timetodl,tmp), cur_cps);
 		bputs(P_TRUNCATE, text[FileHdrDescSeparator]);
+	}
 	if(show_extdesc && f->extdesc != NULL && *f->extdesc) {
 		char* p = f->extdesc;
 		SKIP_CRLF(p);