Initial work on rollback and refactor

src/args.rs

@@ -0,0 +1,15 @@
+use bevy::prelude::*;
+use clap::Parser;
+
+#[derive(Parser, Debug, Clone, Resource)]
+#[command(version, about, long_about = None)]
+pub struct Args {
+    #[clap(long)]
+    pub synctest: bool,
+    #[clap(long, default_value_t = 2)]
+    pub input_delay: usize,
+    #[clap(long, default_value_t = 2)]
+    pub check_distance: usize,
+    #[clap(long, default_value_t = 1)]
+    pub players: usize
+}