Simplify platform-specific keyboard layouts with Accel key and global platform variable (#748)

* Simplify platform-specific keyboard layouts with Accel key and global platform variable


Co-authored-by: Dennis <dennis@kobert.dev>

editor/src/messages/globals/globals_message.rs

@@ -0,0 +1,10 @@
+use crate::messages::portfolio::document::utility_types::misc::Platform;
+use crate::messages::prelude::*;
+
+use serde::{Deserialize, Serialize};
+
+#[impl_message(Message, Globals)]
+#[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+pub enum GlobalsMessage {
+	SetPlatform { platform: Platform },
+}