Make WindowAttributes private (#2134)

* Make `WindowAttributes` private, and move its documentation

* Reorder WindowAttributes title and fullscreen to match method order

src/platform_impl/windows/window.rs

@@ -85,7 +85,7 @@ pub struct Window {
 }
 
 impl Window {
-    pub fn new<T: 'static>(
+    pub(crate) fn new<T: 'static>(
         event_loop: &EventLoopWindowTarget<T>,
         w_attr: WindowAttributes,
         pl_attr: PlatformSpecificWindowBuilderAttributes,

src/platform_impl/windows/window_state.rs

@@ -112,7 +112,7 @@ pub enum ImeState {
 }
 
 impl WindowState {
-    pub fn new(
+    pub(crate) fn new(
         attributes: &WindowAttributes,
         taskbar_icon: Option<Icon>,
         scale_factor: f64,