Attempt to removed xtl dependency

[anutosh491]

Fixes #108

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.45%. Comparing base (e788167) to head (1042afb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   62.66%   63.45%   +0.79%     
==========================================
  Files          15       15              
  Lines         600      613      +13     
  Branches       59       60       +1     
==========================================
+ Hits          376      389      +13     
  Misses        224      224              

Files	Coverage Δ
src/xinspect.hpp	69.49% <ø> (ø)
src/xinterpreter.cpp	88.30% <100.00%> (+0.96%)	⬆️
src/xutils.cpp	78.57% <ø> (ø)

Files	Coverage Δ
src/xinspect.hpp	69.49% <ø> (ø)
src/xinterpreter.cpp	88.30% <100.00%> (+0.96%)	⬆️
src/xutils.cpp	78.57% <ø> (ø)

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[anutosh491]

Hmm wait, I think pertaining to this line
https://github.com/jupyter-xeus/xeus/blob/1bbef7208ed3d92a90eadce752d3b56b7636f920/xeusConfig.cmake.in#L25, we might not be able to drop the dependency of xtl from xeus-cpp ( The dependency chain might be xeus-cpp -> xeus-zmq -> xeus -> xtl)

[vgvassilev]

Ah, that's a good point... :(

[JohanMabille]

I think most of the features we use from the xtl are actually specific to xeus, meaning we could actually move or duplicate the code in xeus. I'm not 100% sure though.