Language plugin for the Corn configuration language for Intellij.

• Changes to grammar should be made to Corn.bnf
  • Regenerate parser - https://plugins.jetbrains.com/docs/intellij/grammar-and-parser.html#generate-a-parser
• Changes to lexer should me mad eto Corn.flex
  • Regenerate lexer - https://plugins.jetbrains.com/docs/intellij/lexer-and-parser-definition.html#generate-a-lexer-class