Add FileURL text.dat string, used when displaying file info

This is an optional (default: blank) string that can be used to display a
file's URL(s) (e.g. FTP and/or Web URLs, using @-codes) when viewing extended
file information. I currently have this string output before the file
description.

The idea is that a sysop could set this string (e.g in their ctrl/text.ini)
instead of or in-addition-to their text/menu/download.msg file and then the
file URL(s) would be more readily displayed (not just went prompting for a
download protocol to send said file).

ctrl/text.dat

@@ -1109,3 +1109,4 @@
 "paging node %u for private chat"                          922 NodeActivityPagingNode
 "retrieving file from device #%d"                          923 NodeActivityRetrievingFile
 "performing custom activity"                               924 NodeActivityCustom
+""                                                         925 FileURL

src/sbbs3/file.cpp

@@ -60,6 +60,7 @@ void sbbs_t::showfileinfo(file_t* f, bool show_extdesc)
 		if(f->file_idx.hash.flags & SMB_HASH_SHA1)
 			bprintf(P_TRUNCATE, text[FiChecksum], "SHA-1", SHA1_hex(tmp, f->file_idx.hash.data.sha1));
 	}
+	bputs(P_TRUNCATE, text[FileURL]);
 	if(f->desc && f->desc[0])
 		bprintf(P_TRUNCATE, text[FiDescription],f->desc);
 	if(f->tags && f->tags[0])

src/sbbs3/text.h

@@ -941,6 +941,7 @@ enum text {
 	,NodeActivityPagingNode
 	,NodeActivityRetrievingFile
 	,NodeActivityCustom
+	,FileURL
 
 	,TOTAL_TEXT
 };

src/sbbs3/text_defaults.c

@@ -1488,4 +1488,5 @@ const char * const text_defaults[TOTAL_TEXT]={
 	,"\x70\x61\x67\x69\x6e\x67\x20\x6e\x6f\x64\x65\x20\x25\x75\x20\x66\x6f\x72\x20\x70\x72\x69\x76\x61\x74\x65\x20\x63\x68\x61\x74" // 922 NodeActivityPagingNode
 	,"\x72\x65\x74\x72\x69\x65\x76\x69\x6e\x67\x20\x66\x69\x6c\x65\x20\x66\x72\x6f\x6d\x20\x64\x65\x76\x69\x63\x65\x20\x23\x25\x64" // 923 NodeActivityRetrievingFile
 	,"\x70\x65\x72\x66\x6f\x72\x6d\x69\x6e\x67\x20\x63\x75\x73\x74\x6f\x6d\x20\x61\x63\x74\x69\x76\x69\x74\x79" // 924 NodeActivityCustom
+	,"" // 925 FileURL
 };

src/sbbs3/text_id.c

@@ -925,4 +925,5 @@ const char* const text_id[]={
 	,"NodeActivityPagingNode"
 	,"NodeActivityRetrievingFile"
 	,"NodeActivityCustom"
+	,"FileURL"
 };