chore: Do not #[macro_use] glib

Author: ids1024

src/application/keyboard.rs

@@ -1,6 +1,6 @@
 use cascade::cascade;
 use glib::object::WeakRef;
-use glib::subclass;
+use glib::{clone, subclass};
 use gtk::prelude::*;
 use gtk::subclass::prelude::*;
 use std::{

src/application/main_window.rs

@@ -1,5 +1,5 @@
 use cascade::cascade;
-use glib::subclass;
+use glib::{clone, subclass};
 use gtk::prelude::*;
 use gtk::subclass::prelude::*;
 use std::rc::Rc;

src/lib.rs

@@ -1,6 +1,3 @@
-#[macro_use]
-extern crate glib;
-
 pub mod application;
 pub mod daemon;