Fix #18 - Add create/update map tool

[shoo]

No description provided.

[codecov]

Codecov Report

Merging #19 into master will increase coverage by 3.11%.
The diff coverage is 89.23%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   79.61%   82.72%   +3.11%     
==========================================
  Files          10       11       +1     
  Lines         667      712      +45     
==========================================
+ Hits          531      589      +58     
+ Misses        136      123      -13     

Impacted Files	Coverage Δ
source/cushion/helper.d	86.04% <86.04%> (ø)
source/cushion/csvdecoder.d	97.82% <95.45%> (+21.15%)	⬆️

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