🆕 What's in this release?

Support for indentation, templates for specifying highlight functions, and placeholder attributes for <code-input> custom element
Built-in templates (register using codeInput.registerTemplate(template_name, template); link to element using template attribute):
- codeInput.template.prism(prism)
  - Prism.js support built-in
- codeInput.template.hljs(hljs)
  - highlight.js support built-in
- codeInput.template.characterLimit()
  - Maximum character count in data-character-limit attribute
  - Characters over limit in mark.overflow element
  - Overflow message shown in mark.overflow-msg element
- codeInput.rainbowText(rainbow_colors?, delimiter?)
  - Styles each section of text split by delimiter to color in rainbow_colors array

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