Spin Safety

[meowgorithm]

This update associates spinner.TickMsgs with with spinners so that spinners will only respond to their own messages. This helps prevent spinners from spinning out of control and allows you to start and stop specific spinners without any logical gymnastics.

As a side effect of this change, the spinner.Tick command has been deprecated in favor of spinner.Model.Tick:

import `github.com/charmbracelet/bubbles/spinner`

// Deprecated: this will start any spinner that receives the resulting TickMsg
return m, spinner.Tick

// New: start a specific spinner
return m, m.mySpinner.Tick()