slint_lsp + treesitter for haxe + moved to lua ftplugins

lua/plugins/treesitter.lua

@@ -0,0 +1,34 @@
+return {
+  'nvim-treesitter/nvim-treesitter',
+  lazy = false,
+  build = ':TSUpdate',
+  config = function()
+    vim.api.nvim_create_autocmd("User", {
+      pattern = "TSUpdate",
+      callback = function()
+        local parsers = require 'nvim-treesitter.parsers'
+        parsers.haxe = {
+          install_info = {
+            url = "https://github.com/vantreeseba/tree-sitter-haxe",
+            branch = "main",
+            queries = "queries",
+            revision = "a25faf5efa842502a326ec803cfbe5a442a11e7c",
+          },
+          tier = 0,
+        }
+      end,
+    })
+
+    vim.filetype.add({ extension = { hx = "haxe" } })
+
+    vim.api.nvim_create_autocmd("FileType", {
+      pattern = "haxe",
+      callback = function()
+        local language = vim.treesitter.language.get_lang("haxe")
+        if language and vim.treesitter.language.add(language) then
+          vim.treesitter.start()
+        end
+      end,
+    })
+  end,
+}