Partial reverse of usersystemlib.prx

module_start, sceKernelGetThreadId, sceKernelCheckThreadStack,
sceKernelTryLockLwMutex, sceKernelTryLockMutex_600
add eof newlines
remove comments from exports.exp
s64 return type for sceKernelTryLockLwMutex
sceKernelUnlockLwMutex, some fixes
sceKernelReferLwMutexStatus
Kernel_Library_3AD10D4D
owner becomes thid
correct sceKernelGetThreadId
correct sceKernelCheckThreadStack
clean globals, SceThread struct
add sceKernelLockLwMutexCB, sceKernelLockLwMutex
pspGetK0, Kernel_Library_FA835CDE with some thoughts
sceGe_lazy_31129B95
use pspLl and pspSc
add naive sceKernelMemcpy and sceKernelMemset
g_cmdList
now compiling
avoid sceKernelCheckThreadStack recursivity
more corrections