SML LSP Client Plugin for Jetbrains IDEs

this should be at feature parity with the official Millet VSCode plugin, let me know if there is something that I'm missing

why: I dislike VSCode and I prefer a full-fledged IDE experience

credits: Thanks to the contributors to Standard ML and the contributors that worked on Millet. This work is reliant on Millet's Language Server.

requirements:

1. An IntelliJ IDE

to setup:

1. install the plugin into your IDE by going to Plugins and selecting the Install Plugin from Disk option within the settings button at the top of the Plugins tab
2. download the millet-ls file from https://github.com/azdavis/millet/releases/ and add it to PATH or compile your own millet-ls file by building from the GitHub
3. restart IntelliJ

This should be compatible with any themes you use, and syntax highlighting should adapt.