Minor refactors and cleanups

src/engine/Engine.zig

@@ -398,7 +398,7 @@ pub fn init(allocator: std.mem.Allocator, maybe_window: ?*glfw.Window) !Engine {
 }
 
 pub fn deinit(self: *Engine) void {
-    std.log.debug("Deinitializing {*}", .{self});
+    std.log.scoped(.deinit).debug("Deinitializing {*}", .{self});
 
     const allocator = self.vk_allocator.allocator;