Add op access for OpCodeInfo and Code

[susitsm]

Iced provides OpAccess through the InstructionInfoFactory interface which does advanced analysis based on concrete operands of an instruction. This merge request aims to add a simpler OpAccess API which uses data derivable from the Code enum and does not need full instructions.

The code compiles but it is a WORK IN PROGRESS.

Unresolved issues:

• Some code generator generated code was modified in 40f17c3. Those modifications should be moved to the code generator
• Some new functions are missing documentation
• Add documentation to InstructionInfo about how it simplifies operand accesses.
• Move functions to where they belong: most new code was put into src/rust/iced-x86/src/encoder/code_flags.rs, some of it might be better placed somewhere else.
• Fix the remaining todo!()-s in Code::op0_access. I didn't know how some of them should be converted. I would appreciate any feedback/help you can give me.

[wtfsck]

Makes sense to add those functions to Code/OpCodeInfo.

Not sure if OpCodeInfo needs the extra op_accesses field since it can just call the Code functions.

One thing missing is tests for all new APIs. Could be a lot more work so maybe I'll add that sometime. Would require (C# code, see generator code) generating a new txt file for at least the Code test that would include the Code value and the OpAccess values, write a parser for it (should be easy, split the line), add the test code somewhere.

[susitsm]

Removed op access from OpCodeInfo, there is no need to do the same thing multiple ways. I also added a miniscule amount of docs about the optimizations done by InstructionInfoFactory.

There is one more thing I am not sure about, and that is OpInfo0::WriteMem_ReadWriteReg. Currently, I convert it to OpAccess::ReadWrite, but I am thinking that maybe we should create a CodeOpAccess enum, and just leave it as-is. Similarly to OpCodeOperandKind and OpKind.

Also, I could not find any info about OpInfo0::CondWrite32_ReadWrite64. We might also want to leave that as its own kind.