Remove ctags.c and move its content to routines.c, main.c and options.c

This is mostly just moving code with just some minor modifications:
- removal of code of unsupported platforms (VAX, OS2, etc.)
- syncing includes/headers of affected files with uctags
- removal of some functions we don't need in Geany and whose movement
  would require additional changes (those will get added back when
  doing final sync with uctags)
- minor whitespace syncs

ctags/Makefile.am

@@ -55,7 +55,6 @@ parsers = \
 libctags_la_SOURCES = \
 	main/args.c \
 	main/args.h \
-	main/ctags.c \
 	main/ctags.h \
 	main/debug.h \
 	main/entry.c \
@@ -67,6 +66,7 @@ libctags_la_SOURCES = \
 	main/lcpp.c \
 	main/lcpp.h \
 	main/lregex.c \
+	main/main.c \
 	main/main.h \
 	main/mio.c \
 	main/mio.h \
@@ -79,6 +79,7 @@ libctags_la_SOURCES = \
 	main/parsers.h \
 	main/read.c \
 	main/read.h \
+	main/routines.c \
 	main/routines.h \
 	main/sort.c \
 	main/sort.h \

ctags/main/args.c

@@ -18,7 +18,7 @@
 #include <ctype.h>
 
 #include "args.h"
-#include "main.h"
+#include "routines.h"
 
 /*
 *   FUNCTION DEFINITIONS