capstone: add cs_regs_access

[SWW13]

Adds support for cs_regs_access, fixes #63.

I'm not sure how to implement the tests yet, the instructions_* tests are a bit complicated on first sight.

[codecov[bot]]

Codecov Report

Merging #77 into master will increase coverage by 0.35%. The diff coverage is 71.75%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
+ Coverage   93.81%   94.17%   +0.35%     
==========================================
  Files          20       20              
  Lines        2701     3983    +1282     
==========================================
+ Hits         2534     3751    +1217     
- Misses        167      232      +65

Impacted Files	Coverage Δ
capstone-rs/src/test.rs	97.27% <100%> (+1.26%)	:arrow_up:
capstone-rs/src/capstone.rs	96.74% <100%> (+2.78%)	:arrow_up:
capstone-rs/src/instruction.rs	76.22% <48.61%> (-11.85%)	:arrow_down:
capstone-rs/src/error.rs	63.41% <0%> (-1.59%)	:arrow_down:
capstone-rs/src/constants.rs	79.06% <0%> (-0.45%)	:arrow_down:
capstone-rs/src/arch/tms320c64x.rs	97.67% <0%> (+0.07%)	:arrow_up:
capstone-rs/src/arch/mod.rs	90.9% <0%> (+0.08%)	:arrow_up:
capstone-rs/src/arch/m68k.rs	91.94% <0%> (+0.15%)	:arrow_up:
... and 1 more

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[tmfink]

@SWW13 Thanks for the pull-request! This is great work.

If you have any questions related to review comments or capstone, feel free to reach out.