IDL extension for Nova

This is a simple extension providing syntax highlighting and completion for the
Interactive Data Language (IDL) in Panic's Nova editor.

Version 0.1 (09 Oct 2020)

Initial release with:
- Basic completion on library routine names
- Basic syntax highlighting of reserved words, strings, and comments
- Proper indentation of next line

Version 0.2

• Added language keywords to completions.
• Adding numeric values

Version 0.2.1

• Minor issue which caused extenion to not work with Nova 4