Replace Recompiler with x86_64 emulation via Unicorn Engine

[bayedieng]

As recompilation takes significant effort due to sheer amount of x86 instructions, we've decided to shift our efforts CPU emulation using the Unicorn Engine framework. This would be a significant change in the codebase which would allow us to more easily pursue pertinent tasks in regards to supporting ps4 games (e.g. graphics, sound, etc...).

[ultimaweapon]

After we was trying on Unicorn we decided not to go this route and we are going to use https://github.com/bytecodealliance/wasmtime/tree/main/cranelift instead. The reasons are:

• Unicorn separated the emulated code from the application code, which make it hard to communication between the code that we run in the Unicorn and our application.
• With the previous reason we need some effort to be able to use it (e.g. implementing a new memory allocator) and if the outcome is not good that mean our effort is losing for nothing.
• From what we saw on the internet the performance of running x86-64 code with QEMU on AArch64 is not good.