Kernel: split GetProcInformation driver ioctl

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This set of patches purposes changing MIRA_GET_PROC_INFORMATION ioctl by separating thread information to a new ioctl, MIRA_GET_THRD_INFORMATION, along with some new information fields for GET_PROC_INFORMATION.

The motivations for this are retrieval of additional information and improved ease of use for callers.
Other included changes are:

• Remove Threads field from MiraProcessInformation, and use fixed numbers for its strings.
• If the requested PID is 0, assume the caller wants its own process' information.
• Pass the number of threads retrieved to the caller
• Use (musl's implementation of) strlcpy to safely copy process and thread strings
• Replaced offset references of title ID with p_titleid field.

If the ioctl split is unwanted (or anything else), I can rework the patches as desired.

This was tested on a Base PS4 9.00, LLVM 16.0.3, on top of the chendo-offset-fix branch and the patches of #162

EDIT:
Other firmware offsets for title ID and content ID are unconfirmed