Add some missing Window getters

Implemented properly when it was easy for me, but a lot of places are
stubbed out for now.

winit-android/src/event_loop.rs

@@ -876,8 +876,16 @@ impl CoreWindow for Window {
         PhysicalInsets::new(0, 0, 0, 0)
     }
 
+    fn min_surface_size(&self) -> Option<PhysicalSize<u32>> {
+        None
+    }
+
     fn set_min_surface_size(&self, _: Option<Size>) {}
 
+    fn max_surface_size(&self) -> Option<PhysicalSize<u32>> {
+        None
+    }
+
     fn set_max_surface_size(&self, _: Option<Size>) {}
 
     fn surface_resize_increments(&self) -> Option<PhysicalSize<u32>> {
@@ -888,8 +896,16 @@ impl CoreWindow for Window {
 
     fn set_title(&self, _title: &str) {}
 
+    fn is_transparent(&self) -> bool {
+        false
+    }
+
     fn set_transparent(&self, _transparent: bool) {}
 
+    fn is_blurred(&self) -> bool {
+        false
+    }
+
     fn set_blur(&self, _blur: bool) {}
 
     fn set_visible(&self, _visibility: bool) {}
@@ -936,8 +952,16 @@ impl CoreWindow for Window {
         true
     }
 
+    fn window_level(&self) -> WindowLevel {
+        WindowLevel::default()
+    }
+
     fn set_window_level(&self, _level: WindowLevel) {}
 
+    fn window_icon(&self) -> Option<winit_core::icon::Icon> {
+        None
+    }
+
     fn set_window_icon(&self, _window_icon: Option<winit_core::icon::Icon>) {}
 
     fn set_ime_cursor_area(&self, _position: Position, _size: Size) {}
@@ -977,6 +1001,10 @@ impl CoreWindow for Window {
 
     fn request_user_attention(&self, _request_type: Option<window::UserAttentionType>) {}
 
+    fn cursor(&self) -> Cursor {
+        Cursor::default()
+    }
+
     fn set_cursor(&self, _: Cursor) {}
 
     fn set_cursor_position(&self, _: Position) -> Result<(), RequestError> {
@@ -1010,6 +1038,10 @@ impl CoreWindow for Window {
         None
     }
 
+    fn content_protected(&self) -> bool {
+        false
+    }
+
     fn set_content_protected(&self, _protected: bool) {}
 
     fn has_focus(&self) -> bool {