Force buffers to be unscaled

Satellite will now force Xwayland to always render with the native
display resolution, and just scale surface sizes accordingly. As a result,
applications won't really respect DPI, but this can be adjusted through
the same means as with normal X11.

Part of #28.

src/xstate/mod.rs

@@ -842,13 +842,13 @@ bitflags! {
     }
 }
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub struct WinSize {
     pub width: i32,
     pub height: i32,
 }
 
-#[derive(Default, Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Default, Debug, PartialEq, Eq)]
 pub struct WmNormalHints {
     pub min_size: Option<WinSize>,
     pub max_size: Option<WinSize>,