Remove ComponentVtable::input_event

And the custom handling of the mouse grabber

sixtyfps_runtime/corelib/lib.rs

@@ -84,6 +84,5 @@ pub fn use_modules() -> usize {
         + properties::ffi::sixtyfps_property_init as usize
         + string::ffi::sixtyfps_shared_string_bytes as usize
         + eventloop::ffi::sixtyfps_component_window_drop as usize
-        + input::ffi::sixtyfps_process_ungrabbed_mouse_event as usize
         + component::ffi::sixtyfps_component_init_items as usize
 }