Configurable bitmap type, minor fixes
- Forced removal of implicit permissions READ_PHONE_STATE, READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE
- #279 Include proguard rules to stop removal of default constructors
- #302 Pass vertical move touch events to parent if not consumed
- #314 Added null-check per method in onStateChangedListener
- #349 Support for other bitmap formats (not just default RGB565)