Minimal AbstractPath API

[rofinn]

Attempts to address #24

[codecov-io]

Codecov Report

Merging #27 into master will increase coverage by 2.51%.
The diff coverage is 84.55%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   81.96%   84.47%   +2.51%     
==========================================
  Files           8       11       +3     
  Lines         427      728     +301     
==========================================
+ Hits          350      615     +265     
- Misses         77      113      +36

Impacted Files	Coverage Δ
src/FilePathsBase.jl	100% <ø> (+45.45%)	⬆️
src/utils.jl	100% <ø> (ø)	⬆️
src/posix.jl	64% <66.66%> (+8%)	⬆️
src/windows.jl	74.46% <66.66%> (-2.81%)	⬇️
src/system.jl	72.03% <72.03%> (ø)
src/path.jl	81.11% <73.73%> (-4.54%)	⬇️
src/buffer.jl	85.18% <85.18%> (ø)
src/test.jl	97.58% <97.58%> (ø)
src/libc.jl	52% <0%> (-13.52%)	⬇️
... and 6 more

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