Prepend new timers to front of list, not back

Also, add Remove operation

app_state.go

@@ -150,6 +150,13 @@ func (a *AppState) initialize() {
 		},
 		a.opSwitchTimer,
 	)
+	a.addOperation("rm",
+		[]string{
+			"rm [id]                                               - Removes the timer with the given id",
+			"                                                        WARNING: CANNOT BE UNDONE",
+		},
+		a.opRemoveTimer,
+	)
 	a.addOperation("archive",
 		[]string{
 			"archive [id]                                          - Archive the timer with the given id",

timer_ops.go

@@ -267,6 +267,33 @@ func (a *AppState) opArchiveTimer(args []string) int {
 	return 0
 }
 
+func (a *AppState) opRemoveTimer(args []string) int {
+	if len(args) == 0 {
+		fmt.Println("No timer id given")
+		return 1
+	}
+	id, err := strconv.Atoi(args[0])
+	if err != nil {
+		fmt.Println("Invalid timer id given: " + args[0])
+	}
+	t, err := a.TimerList.GetTimer(id)
+	if err != nil {
+		fmt.Println("Error getting timer with id: " + args[0])
+		return 1
+	}
+	if err = a.TimerList.RemoveTimerById(id); err != nil {
+		fmt.Println("Error Removing Timer: " + err.Error())
+		return 1
+	}
+	fmt.Println("Timer removed")
+	fmt.Println(TimerToString(t))
+	if err := a.WriteList(); err != nil {
+		fmt.Println(err.Error())
+		return 1
+	}
+	return 0
+}
+
 func (a *AppState) opModifyTimer(args []string) int {
 	var timer *timertxt.Timer
 	var contexts, projects []string