move from File to Path types

[erdos]

Move from using the legacy java.io.File to java.nio.file.Path from the NIO2 update for the Java API.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.65%. Comparing base (c8fca89) to head (5409bae).

Files	Patch %	Lines
src/stencil/api.clj	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
- Coverage   93.78%   93.65%   -0.14%     
==========================================
  Files          30       30              
  Lines        2076     2080       +4     
  Branches       92       95       +3     
==========================================
+ Hits         1947     1948       +1     
  Misses         37       37              
- Partials       92       95       +3     

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