Pure kernel-only lib generation

[hitodama]

Implement clean kernel-only lib generation to create pure relocatable kernel payloads (complexer kernel progs, syscalls)

• Separate user and kernel function, esp. when they are accessible to both (e.g, ps4KernelDlSym) so we don't get any user mode entangled functions (anything is a r/w/e into kernel space).
• Potentially build all kernel functions in by default (even without available signature)?

Will be on a branch and take a few days (not complex but no time :|)