Improve support for bounded context canvases

[boxleytw]

There are three commits:

• Improve support for bounded context canvases with "business model" and "evolution" fields in the DSL grammar
• For those using Jenv, pin the local build to Java 11
• Layout recommendations from PR feedback

[codecov[bot]]

Codecov Report

Merging #323 (4d3c8c2) into master (4e3142f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #323   +/-   ##
========================================
  Coverage      93.0%   93.0%           
  Complexity     2299    2299           
========================================
  Files           201     201           
  Lines          6159    6159           
  Branches        830     830           
========================================
  Hits           5728    5728           
  Misses          213     213           
  Partials        218     218           

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[boxleytw]

@stefan-ka Thanks for the suggestion. I pushed an update to match.