un/pause mutate self instead of taking ownership (uses Copy)

src/timer.rs

@@ -199,16 +199,18 @@ impl<T:TimerState> Timer<T>{
 			Self::Unpaused(timer)=>timer.set_time(time,new_time),
 		}
 	}
-	pub fn pause(self,time:Time)->Result<TimerFixed<T,Paused>,Error>{
-		match self{
-			Self::Paused(_)=>Err(Error::AlreadyPaused),
-			Self::Unpaused(timer)=>Ok(timer.into_paused(time)),
-		}
+	pub fn pause(&mut self,time:Time)->Result<(),Error>{
+		*self=match *self{
+			Self::Paused(_)=>return Err(Error::AlreadyPaused),
+			Self::Unpaused(timer)=>Self::Paused(timer.into_paused(time)),
+		};
+		Ok(())
 	}
-	pub fn unpause(self,time:Time)->Result<TimerFixed<T,Unpaused>,Error>{
-		match self{
-			Self::Paused(timer)=>Ok(timer.into_unpaused(time)),
-			Self::Unpaused(_)=>Err(Error::AlreadyUnpaused),
-		}
+	pub fn unpause(&mut self,time:Time)->Result<(),Error>{
+		*self=match *self{
+			Self::Paused(timer)=>Self::Unpaused(timer.into_unpaused(time)),
+			Self::Unpaused(_)=>return Err(Error::AlreadyUnpaused),
+		};
+		Ok(())
 	}
 }