Add check if lexical_cast fully consumed input on integer conversion

[SX91]

Would be even better to add checks for integer overflow on long long to T conversions.

[SX91]

Complex numbers parsing is broken now.
With istringstream lexical_cast is able to parse complex numbers with streaming operators.

[codecov]

Codecov Report

Merging #68 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #68   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines        1371   1390   +19     
=====================================
+ Hits         1371   1390   +19

Impacted Files	Coverage Δ
include/CLI/App.hpp	100% <100%> (ø)	⬆️
include/CLI/TypeTools.hpp	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f089255...1ec0fb6. Read the comment docs.

[henryiii]

Thanks!