John's networking code

[L5050]

• Added John's addresses from his networking code to spm-headers
• Ported addresses to US0 and JP0
• Added his spm-errno.h
  After this is merged you'll be able to use both his evtpatch and his networking code together and on the 4 main versions of the game

[SeekyCt]

This should have a CPP_WRAPPER with the msl namespace. It'd also be ideal to have the official name of errno rather thatn spm_errno, but I don't know if that would affect compatibility with the network mod's setup at all

[L5050]

annoyingly enough it does, I think ill just remove it from spm headers and put it in the include folder for now

[SeekyCt]

The symbol is still in the lsts

[L5050]

found a way to keep errno.h in the msl namespace while also keeping compatibility with the network mod
__errno doesnt appear to be a real spm function, its just one that john made for this mod specifically, so I removed that from spm headers and made a .h file in the network mod's include so that the mod would still work

[SeekyCt]

But the symbol name is still spm_errno

[L5050]

fixed, sorry

[SeekyCt]

And this definitely doesn't break the network mod in any way?

[L5050]

nope, I just had to change some of the local code in my fork
Ill probably make a PR to johns repo with the changed local code