151 fix gui horizontal spacing of hexagons optional

[JSteve0]

• Fixed GUI spacing
• Added canvas package

closes #151

[codecov[bot]]

Codecov Report

Merging #216 (e7c72b2) into develop (9472493) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #216   +/-   ##
========================================
  Coverage    88.46%   88.46%           
========================================
  Files            3        3           
  Lines           52       52           
  Branches        11       11           
========================================
  Hits            46       46           
  Misses           6        6           

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