Experimental SELF decryption support

This SELF decryption feature is not portable and its code looks really
ugly. It is experimental and is meant to save time to developers when
doing tests with SELF files. Besides that, it works (under Windows). :-)

How to use it:
1. Place "scetool.exe" (and "zlib1.dll") into the main rpcs3 folder.

2. Obtain a LEGAL copy of the SELF decryption keys and place them in a
folder named "data" next to the main executable in a format that is
readable for "scetool.exe". That is, following files should be present:
data/keys
data/ldr_curves
data/vsh_curves

(See screenshot in the comments)

NOTE: These are the steps to enable SELF decryption and it applies to
future commits regarding this matter. We do NOT take any responsibility
about the way you obtain the keys or (until we include SELF decryption
into our code) the actions "scetool.exe" (or "zlib1.dll") perform.
SELF decrypter improves & About... dialog added

SELF decrypter improved:
The files 'scetool.exe' and 'zlib1.dll' are no longer needed. Everything
needed is now included in the rpsc3 project. So the only thing you need
in order to load SELF files are the keys. More information about this
matter in my last commit: c1565e55

Warning for devs! There is a lot of spaghetti code in /scetool/. I
fucked up things a bit while trying to include scetool in rpcs3. There
is a lot of unused code there and I need to make sure that everything is
working properly. In any case, the code seems to work stable so
end-users shouldn't be worried about this warning. ;-)

'About...' dialog added:
Well, I have nothing more to say here. I wish you all a nice day!
Added ELF32 little endian support for PSP ELF files.
Merge pull request #9 from Hykem/master

Add SELF decryption and ELF32 little endian support