* cpu_patches: Remove CPU patches for macOS and bump minimum OS version to 15.4
* cpu_patches: Remove BMI1 patches
These are now only good for very old Intel CPUs that:
* Still do not currently function due to other CPU instruction issues.
* Will probably be too slow to run shadPS4 well.
* core: Split error codes into separate files
* Reduces build times and is cleaner
* core: Bring structs and enums to codebase style
* core: More style changes
* cpu_patches: Patch just-in-time using illegal instruction handler.
* core: Add common signal dispatch system and use for on-demand TCB patches.
* page_manager: Re-add userfaultfd implementation.
