Anubis / Xlib

…CXM_multihost_http_server.anubis".
Adding "Bool using_state_cookies" in "make_web_site_description" in "web/CXM_making_a_web_site.anubis"
Adding "make_state_cookie_headers" in "web/CXM_making_a_web_site.anubis"

TODO in "web/CXM_making_a_web_site.anubis" line 2295 :
    // TODO 'make_separate_web_args_function' must retrieve state_cookies before parsing web_args if using_state_cookies is true

add settings management for sqlite3 database

- Function 'dump_http_headers': it now supports a prefix (as second param) to be displayed as line prefix such as "\t".

Bug fixes:
 - Function 'dump_http_info': IP address was displayed as Word32. Now, it's displayed as IP address string : call of 'ip_addr_to_string'.

- File 'web/CXM_web_dump.anubis' : contains all functions for dumping datas for web as Web_arg, HTTP_header, HTTP_Info.

Modifications :
 - Move : function 'dump_web_arg_values' is now located in 'web/CXM_web_dump.anubis'.

Web: adding attr() alternative to Text_Option type

- Fix URL decoding bug when %xx is upper case

- HTTP redirect codes add needed 'Location' header.