feat: reimplement cycles newtype

src/bus.rs

@@ -1,3 +1,5 @@
+use crate::instruction::Cycles;
+
 use super::cartridge::Cartridge;
 use super::high_ram::HighRAM;
 use super::interrupt::Interrupt;
@@ -50,6 +52,12 @@ impl Bus {
     pub fn load_cartridge(&mut self, path: &str) {
         self.cartridge = Some(Cartridge::new(path).unwrap());
     }
+
+    pub fn step(&mut self, cycles: Cycles) {
+        let _ = self.timer.step(cycles);
+        let _ = self.sound.step(cycles);
+        let _ = self.ppu.step(cycles);
+    }
 }
 
 impl Bus {