osx: Replace the LLDB parser/engine with a macho-parser + mach-engine

[SimonKagstrom]

Improves performance ~20x, making it usable on OSX.

Some remaining issues, which may or may not be solved in the future:

• dsymutil needs to be run on the binary
• kcov needs to be signed with the debugger entitlement
• attaching to a pid does not work
• covering shared libraries does not work

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.22% 🎉

Comparison is base (a013c1c) 63.98% compared to head (d021250) 64.20%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
+ Coverage   63.98%   64.20%   +0.22%     
==========================================
  Files          58       58              
  Lines        4634     4629       -5     
  Branches     4290     4285       -5     
==========================================
+ Hits         2965     2972       +7     
+ Misses       1669     1657      -12     

Files Changed	Coverage Δ
src/solib-handler.cc	64.22% <100.00%> (+0.33%)	⬆️

... and 10 files with indirect coverage changes

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