TinTinPlusPlus for Sublime Text currently contains an syntax highlighting, loosely based on this. Currently working on adding snippets, completions, and linting.
Not currently supported.
Clone this repository to the Packages folder. If you don't know where it is, go to Preferences > Browse Packages... and it should open the folder for you.
Just download the tintin.tmLanguage file into your Packages folder. Refer to the Git section to find your Packages folder.