A small free .Net and JS library (with demo UI, command-line bulk formatter, SSMS/VS add-in, notepad++ plugin, winmerge plugin, and demo webpage) for reformatting and coloring T-SQL code to the user's preferences.
After some playing around, it turns out I just had a fundamentally broken understanding of the VS extensibility support assemblies, and fixing some references made everything OK.
As per @spottedmahn's comment in #229, and 's response at https://twitter.com/mkristensen/status/1156951444018192386, it should be possible to easily support VS 2015 in the current/latest extension.
After some playing around, it turns out I just had a fundamentally broken understanding of the VS extensibility support assemblies, and fixing some references made everything OK.
This issue tracks the change/fix.