Created an interface for all components that want to know about recording status through the service.
All interface's methods are optional so every component can implement what they need.
Fixes#388.
* correct thread handling in ButtonDelay
Discovered in #390 for devices with API Level 25. Not fixing the whole issue, but a first step.
* fix#390 crash when stopping for older devices
The VectorDrawable ic_button_stop.xml referenced from withing the AnimatedVectorDrawable ic_button_stop_anim.xml was a problem for older devices. Now the VectorDrawable is expanded (duplicated) inside the AnimatedVectorDrawable. Now it is working. Even with the animation.
* fix#241 stop button lock
Adds a delay and animation to the stop and pause buttons
- short vibration when starting to push the buttons
- long vibration when action was executed
- Toast to show "Hold to stop/pause recording"
Dennis Guse