Support for Hurl Syntax coloring

This enables basic syntax coloring for Hurl files in IntelliJ, until a proper Hurl Intellij plugin is developed (help is welcome 🤓).

Linux

1. Quit IntelliJ (or CLion etc...)
2. Copy Hurl.xml to ~/.config/JetBrains/[YOUR IDE DIR]/filetypes
3. Start IntelliJ

macOS

1. Quit IntelliJ (or CLion etc...)
2. Copy Hurl.xml to ~/Library/Application Support/JetBrains/[YOUR IDE DIR]/filetypes
3. Start IntelliJ

Windows

1. Quit IntelliJ (or CLion etc...)
2. Copy Hurl.xml to C:\Users[YOUR USER]\AppData\Roaming\JetBrains[YOUR IDE DIR]\filetypes
3. Start IntelliJ