neovim treesitter support

[leaty]

I just want to note that some colors end up being the same while using treesitter, the wrongly set colors are very slightly "more correct" when using the default theme rather than wal. Perhaps something to look into when treesitter support is officially released.

wal with treesitter highlight:

wal without treesitter highlight:

default with treesitter highlight:

[leaty]

Oh and if you know by hand what would need to be changed for use and for (this is rust btw), please let me know! Those seem to be the main issues, I'm just not familiar with all the vim highlight options to know where to look.