options: provide meta-data about all easy options

This is a generated table with information about all existing options
that curl_easy_setopt() might accept. The list contains the option name,
the option value and the option type.

The purpose is to provide detailed enough information to allow for
example libcurl bindings to get option information at run-time about
what options that exist and what of argument they expect.

THIS IS WORK IN PROGRESS, MEANT AS A DISCUSSION STARTING POINT. Not the
final version.

lib/Makefile.inc

@@ -60,7 +60,8 @@ LIB_CFILES = altsvc.c amigaos.c asyn-ares.c asyn-thread.c base64.c            \
   sendf.c setopt.c sha256.c share.c slist.c smb.c smtp.c socketpair.c socks.c \
   socks_gssapi.c socks_sspi.c speedcheck.c splay.c strcase.c strdup.c         \
   strerror.c strtok.c strtoofft.c system_win32.c telnet.c tftp.c timeval.c    \
-  transfer.c urlapi.c version.c warnless.c wildcard.c x509asn1.c dynbuf.c
+  transfer.c urlapi.c version.c warnless.c wildcard.c x509asn1.c dynbuf.c     \
+  options.c
 
 LIB_HFILES = altsvc.h amigaos.h arpa_telnet.h asyn.h conncache.h connect.h    \
   content_encoding.h cookie.h curl_addrinfo.h curl_base64.h curl_ctype.h      \
@@ -79,7 +80,7 @@ LIB_HFILES = altsvc.h amigaos.h arpa_telnet.h asyn.h conncache.h connect.h    \
   smb.h smtp.h sockaddr.h socketpair.h socks.h speedcheck.h splay.h strcase.h \
   strdup.h strerror.h strtok.h strtoofft.h system_win32.h telnet.h tftp.h     \
   timeval.h transfer.h urlapi-int.h urldata.h warnless.h wildcard.h           \
-  x509asn1.h dynbuf.h
+  x509asn1.h dynbuf.h options.h
 
 LIB_RCFILES = libcurl.rc