New Shared Memory

[trevius]

I imagine KLS will chime in on this thread, but here is the changelog update about it:

== 02/27/2013 ==
KLS: Changed how shared memory works:
    Instead of System V/windows pagefile shared memory we now have shared memory that's backed by the filesystem.
    What that means is basically instead of EMuSharedMem(shared library) we now have shared_memory(executable), 
    shared memory will be persistent between runs until you delete or reload it using the shared_memory executable.
    
    STEPS FOR PEOPLE WHO CAN'T BE BOTHERED TO FIGURE IT OUT:
        1) Create a directory in the place you run world/zone named shared and make sure files can write there.
        2) Run the shared_memory executable from the same place you run world/zone 
        (it's basically doing the loading we would do on startup so will take a moment).
        3) Run world/zone/whatever

[KLS]

The biggest advantage is to people like me who have to restart zone over and over and over while developing incrementally. Which took me about a minute each time (guh). Now I only need to process the data when it changes. Which means cold zone boot ups go from about 60 seconds to about 3 seconds.

A secondary reason (and the main motivator for me) was to make it easier to put things into shared memory if we need to. It was such an utter pain before that no one bothered to even try. It's pretty easy now though.

And of course never having to run cleanipc ever again is a nice perk.