fix null-ls cppcheck, add buffermappings, better window highlighting

lua/core/autocmd.lua

@@ -18,3 +18,15 @@ vim.api.nvim_create_autocmd({"BufWinEnter"}, {
   desc = "load view (folds), when opening file",
   command = "silent! loadview"
 })
+
+vim.api.nvim_create_autocmd("WinEnter", {
+    callback = function()
+        vim.wo.cursorline = true
+    end,
+})
+
+vim.api.nvim_create_autocmd("WinLeave", {
+    callback = function()
+        vim.wo.cursorline = false
+    end,
+})