Implement dedicated arch classes for ARM Cortex-A/R

[elicn]

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Implement QlArch subclasses for different ARM core types, including relevant registers mapping:

• [x] Cortex-M
• [ ] Cortex-A
• [ ] Cortex-R

[ckudera]

I'm not sure if the differentiation between the ARM architecture profiles is enough. For example, Cortex-M33 (ARMv8-M) implements additional core registers compared to Cortex-M0 (ARMv6-M).

[elicn]

Good point. I'll leave this to the ARM experts to figure out.

[wtdcode]

I'm not sure if the differentiation between the ARM architecture profiles is enough. For example, Cortex-M33 (ARMv8-M) implements additional core registers compared to Cortex-M0 (ARMv6-M).

For Unicorn, by default there is no errors for writing to non-exist registers.

[elicn]

For Unicorn, by default there is no errors for writing to non-exist registers.

I think that the point is that we may need a better granularity than just Cortex X.