Remove modules and update Spark 2.12 version

[alexjbush]

Description

• Removes unused modules
• Updates Spark version for Scala 2.12 to a non-experimental Spark version

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [X] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

[codecov-io]

Codecov Report

Merging #91 into develop will increase coverage by 4.39%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop     #91      +/-   ##
==========================================
+ Coverage     82.8%   87.2%   +4.39%     
==========================================
  Files           61      55       -6     
  Lines         1675    1555     -120     
  Branches        75      62      -13     
==========================================
- Hits          1387    1356      -31     
+ Misses         288     199      -89

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