Merge pull request #11 from SweatyReptile/develop

Develop
Extract default value to constant
Let a sensor be destroyed or unwelded

This is necessary so that sensors may be replaced by different ones
without having memory leaks.
Implement setRange in MusicPlayer

Changes:
- setRange can be used to set the range of the music player to a
different value than the default
- Extract anonymous class to a nested class for easy use inside
MusicPlayer