Go lib to transform between common variable casing conventions

 Varcaser is a library for converting variables between different
 programming language casing conventions.
 .
 Varcaser is now stable. Although bugs that are discovered will be fixed,
 there is no plan to add more features to Varcaser.
 .
 The case transformation component of Varcaser is implemented without
 regular expressions.
 .
 Available Case Conventions:
   - HTTP-Header-Case
   - HttpHeaderCase
   - kebab-case
   - KebabCase
   - LowerCamelCase
   - lowerCamelCase
   - LowerCamelCaseKeepCaps
   - lowerCamelCaseKeepCaps
   - LowerSnakeCase
   - lower_snake_case
   - SCREAMING-KEBAB-CASE
   - ScreamingKebabCase
   - ScreamingSnakeCase
   - SCREAMING_SNAKE_CASE
   - UpperCamelCase
   - UpperCamelCaseKeepCaps