Feature #375: Allow strings for keepNA argument of writeData(Table)/w…

[kainhofer]

Allow strings for keepNA argument of writeData(Table)/write.xlsx to customize the #N/A output

This should implement the feature request #375

[codecov]

Codecov Report

Merging #415 into master will decrease coverage by 0.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
- Coverage   60.23%   60.22%   -0.02%     
==========================================
  Files          30       30              
  Lines        7142     7145       +3     
==========================================
+ Hits         4302     4303       +1     
- Misses       2840     2842       +2

Impacted Files	Coverage Δ
R/writeDataTable.R	71.91% <ø> (ø)	⬆️
R/writeData.R	65.77% <ø> (ø)	⬆️
R/workbook_write_data.R	82.03% <50%> (-1.17%)	⬇️
R/writexlsx.R	59.42% <50%> (ø)	⬆️

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