Add string and path concatenation operators

[rofinn]

Closes #2

[codecov-io]

Codecov Report

Merging #23 into master will decrease coverage by 4.39%.
The diff coverage is 62.5%.

@@           Coverage Diff            @@
##           master     #23     +/-   ##
========================================
- Coverage    86.6%   82.2%   -4.4%     
========================================
  Files           8       8             
  Lines         448     444      -4     
========================================
- Hits          388     365     -23     
- Misses         60      79     +19

Impacted Files	Coverage Δ
src/status.jl	100% <ø> (ø)	⬆️
src/posix.jl	60% <0%> (-4%)	⬇️
src/windows.jl	77.27% <0%> (-4.55%)	⬇️
src/FilePathsBase.jl	54.54% <100%> (ø)	⬆️
src/libc.jl	63.33% <33.33%> (-3.34%)	⬇️
src/path.jl	87.5% <80%> (-3.61%)	⬇️
src/utils.jl	90% <0%> (-10%)	⬇️
src/mode.jl	85.39% <0%> (-6.75%)	⬇️

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[rofinn]

Thanks for reviewing!