* More aggressive cleaning up of the socket code

- removed unused session_data2 entry in sd
- added a new create_session() function, helps keep things cleaner (although it's ad-hoc and not perfect, since this is C)
- undid r4978 since it was getting in the way (re-add it if you need it)
- added defines for the recv, send and parse func pointers
- added null functions for the three actions, and made create_session() calls use those instead of NULL pointers; insignificant penalty and now:
- since all three funcs are always initialized, removed all those NULL checks 
- removed the efd set, since as the people from the developernet forums pointed out, it's only for out-of-band data and NOT for error checking (in fact, select() bails out without giving any info if it errors out)
- reorganized the randomly placed socket.c contents somewhat

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@9822 54d463be-8e91-2dee-dedb-b68131a5f0ec

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