Issue 80

[kbenoit]

Adds reliance on antiword and pdftools.\

Solves #80, solves #81.

Two issues need to be fixed still, relating to commented out tests on Windows:

• the FILE_DIR variables need ARCH added into the path (for Windows only)
• doc and pdf import on Windows keeps a "\r" that is not kept on other platforms

[codecov[bot]]

Codecov Report

Merging #84 into master will increase coverage by 0.53%. The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   85.31%   85.85%   +0.53%     
==========================================
  Files           6        6              
  Lines         429      410      -19     
==========================================
- Hits          366      352      -14     
+ Misses         63       58       -5

Impacted Files	Coverage Δ
R/readtext.R	79.01% <ø> (ø)	:arrow_up:
R/get-functions.R	83.33% <50%> (+1.21%)	:arrow_up:

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