Add wezvar nvim module

vim/lua/wezvar.lua

@@ -0,0 +1,7 @@
+return function(variable, value)
+	vim.fn.chansend(vim.v.stderr, string.format(
+		"\x1b]1337;SetUserVar=%s=%s\x07\n",
+		variable,
+		vim.base64.encode(value)
+	))
+end